Used Mazak Qt-Compact 300My for sale (4,372)

Condition: good (used), Year of construction: 2006, functionality: fully functional, machine/vehicle number: 187859, turning diameter: 380 mm, spindle speed (max.): 5,000 rpm, rotational speed (max.): 4,500 rpm, bar passage: 65 mm, overall weight: 4,900 kg, Mazak QTN-200MS CNC turning and milling center, manufactured in 2006 with subspindle and driven tools Main spindle with Kitagawa chuck and Hainbuch collet chuck, 35-5000 rpm. Subspindle with Kitagawa chuck, 35-6000 rpm. All 19 tool holders, including 5 driven tools Jaws, collet chucks, wrenches and accessories shown in the photo are included. 12-position turret Parts catcher, chip conveyor >>Bar feeder FMB SL80 V (year 2020) >>Conveyor belt The machine has been very well maintained. Hydraulic oil, lubricants, and operating fluids have been recently changed. The machine can be inspected while in operation. Model: QTN-200MS Serial number: 187859 Weight: 4900 kg Weight: 10780 lbs Nwedpfxey Tb D Do Amyji Year of manufacture: 2006 If you have any questions or require further information, please send us a message or call us.

Condition: excellent (used), With C-axis, with driven tools Nwjdpfx Ameu R Nd Eoyoi MAZAK Mazatrol 640T control Turning length -982 mm Swing Diameter -610 mm Turning diametre 264 mm Spindle speeds - 4'000 rpm Tool changer with 12 driven positions Misc. accessories MARCELS MASCHINEN CH

Condition: good (used), Year of construction: 2006, Max cutting diameter 420mm, 750mm swing, max cutting length 1524mm, 102mm bar capacity, 3300rpm spindle, 4000rpm milling, 12 station turret, 30kW motor power, Nwsdpfxeyt H Tve Amyji 3 jaw chuck, Mazatrol 640T Nexus control, 0.001 degree C axis, tool setter, tailstock, swarf conveyor

Condition: used, turning diameter 340 mm turning length 575 mm control Mazatrol SmoothEZ max. swing diameter over bed 695 mm Standard machining diameter 235 mm bar material dia. max. 65 mm x-axis 215 mm rapid traverse X-axis 30 m/min y-axis 100 mm rapid traverse Y-axis 10 m/min z-axis 605 mm rapid traverse Z-axis 30 m/min turning speeds 35 - 5000 U/min spindle nose A2-6 spindle bore 76 mm Motor output (40%ED) 15 KW 11 KW Max. Torque 167 Nm turning speeds 35 - 6000 U/min spindle nose A2-5 Motor output (40%ED) ca. 7,5 KW Power (continuous operation) 5,5 KW Max. Torque 53 Nm Milling spindle speeds ( driven tools) 20 - 4500 1/min torque on milling spindle max: 47 Nm power capacity - milling spindle 5,5 (40% ED) kW Milling spindle power 3,7 kW Numbers of tools 12 (angetrieben) Tool cross section (outside) 25 qmm Boring bar- Ø 40 mm Drill- Ø 20 mm Mill- Ø 20 mm Tap- Ø M20 coolant tank 225 l Chuck diameter main spindle 8 '' Chuck diameter counter spindle 6 '' w-axis 585 mm rapid travel W 30 m/min c-axis 555 weight of the machine ca. 4,9 t dimensions of the machine ca. 2,8 x 2 x 1,8 m Special accessories: - Chip conveyor, hinged belt, side ejector - Production package, this package includes Preparation for bar feed Automatic parts catcher (Ø:80mm x L:120mm x 2.5 kg) 15 bar high-pressure coolant system Preparation for chip conveyor (lateral) Signal light (3-colour LED), rectangular C-axis counter spindle 0.0001° Automatic tool eye 8" power chuck Kitag. BR08 & Cyl. SR1566C (HD1) GENERAL MACHINE OPTIONS Air blowing device on the chuck (counter spindle) Transformer for the European market Linear roller guides SD MEMORY I/F(1P) + USB MEMORY I/F(1P) 1 x USB - Memory Interface (1 slot) CE marking CE marking, metric, 50 Hz Nodpfx Aswngklomyswi Counter spindle positioning 0.0001 degrees without C-axis Tool turret with 12 stations Y-axis control ADDITIONAL PROCESS SOFTWARE Smooth restart function / restart mode Set of manuals in electronic form on CD Main spindle motor AC 15 kW (20 hp) 2nd spindle motor AC 7.5kW (20 hp) Main spindle motor AC 7.5kW MAIN SPINDLE C-axis main spindle Input accuracy (contour/index) 0.0001° Mazak standard colour (F white(fine)/S black) Automatic switch-off via circuit breaker trip Double foot switch Hydraulic pressure interlock RFID door interlock Safety foot switch with locking mechanism Safety measures according to worldwide standard Work area lighting Complete coolant system Automatic opening/closing of chuck jaws (main and counter spindle) Feedback of the chuck status (main and counter spindle) Feedback of the chuck status via sensors. 8" power chuck 6" power chuck (counter spindle) Absolute positioning system Synchronous tapping with milling spindle Relocation Detector NC control Mazatrol SmoothEz 15" colour Lcd (touch screen) User macro (common variables: 600 pairs) EIA/ISO package EIA/ISO - input function EIA/ISO - additional functions Bolt line interpolation 3D tool compensation Workpiece coordinate rotation Geometric function Scaling External data input/output Tapping function (G33) Reverse feed rate G93 G37 Tool length measurement Polar coordinate input (EIA) Optional stop Additional workpiece coordinate systems 300 pieces User macro (600 variables) Mazak tapping/drilling cycle EIA/ISO - input function Scaling External data input/output Thr...

Condition: used, Year of construction: 2012, turning diameter 203 mm turning length 300 mm control Mazatrol Smart Distance spindle end - turret 99-434 mm max. turning diameter 280 mm bar material dia. 51 mm travel -x axis 200 mm travel -z axis 340 mm spindle turning speed range 35 - 6000 U/min rapid traverse X-axis 33 m/min rapid traverse Z-axis 36 m/min spindle bore 61 mm Tool turret 12 -fach turning tool - shaft cross cut 20 Boring bar- Ø 32 mm Nedoynbd Eopfx Amyowi workpiece weight 150 kg spindle nose A2-5 taper in tailstock-quill MK4 Travel- tailstock 350 mm total power requirement 16,3 kW weight of the machine ca. 3,5 t dimensions of the machine ca. 1,9 x 1,6 x 1,8 m Special accessories: Autom Tool Eye Spindle orientation Signal light Additional coolant nozzles above the chuck Automatic switch-off Interface for bar feed Automatic parts catcher Ø 51 x L:100 x 2.5 kg Workpiece conveyor for automatic parts catcher with workpiece tray Chip conveyor, side ejection Includes: Automatic short bar loading magazine LNS QUICK LOAD SERVO 80_S2 Diameter range: 6 - 80 mm round and hexagonal material Bar lengths: 350 - 1600 mm, however max. headstock length /UVV Weight max. 67 kg / bar Burr-free bars or bar sections Depth 600 mm for holding bars Input voltages from 200 – 460 volts / operating voltage 24 V DC, LNS control programmed on SIEMENS STEP 7 PLC, flexible control panel with large screen, user guidance via symbols for easy operation and adjustment. Device cover with 2 viewing windows made of Plexiglas.

Condition: ready for operation (used), Year of construction: 2010, controller manufacturer: MAZATROL, controller model: MATRIX, This 3-axis Mazak QTN 250 M X 1000 horizontal turning machine was manufactured in 2010. If you are looking to get high quality turning capabilities consider the Mazak QTN 250 M X 1000 machine we have for sale. Contact us for more information. Machine Benefits Technical Machine Benefits • Max. Capacity: 640 • X-axis rapid traverse speed: 36000 / z-axis rapid feed speed: 36000 / c-axis rapid feed speed: 555 • Machinable diameter: 380 • Maximum machinable length: 600 • Bar capacity: 76 • Self-centring dimensions (main spindle): 250 • Stroke: 1000/cone: cm 4 Njdpeyalpcjfx Amyjwi • Coolant tank: 300 l

Condition: used, Year of construction: 2005, Mazak QTN 200 lathe, year of manufacture 2005 Mazatrol 640T 210 mm Kitagawa BB 208 chuck Spindle bore 65 mm Turning length 500 mm Turning diameter 380 mm Tailstock Nodpfx Aexgpqpomyjwi Tool probe

Condition: used, Year of construction: 1998, Mazak SQT30M CNC Lathe, year 1998, Japan C-axis, driven tools Mazatrol T plus Turning length: 1000mm 12-inch chuck Spindle bore: 98mm Nwjdpfx Amexutcfoyoi VDI50 turret Tailstock Probe Chip conveyor

Condition: ready for operation (used), Year of construction: 2002, functionality: fully functional, machine/vehicle number: 158015, turning length: 550 mm, turning diameter: 300 mm, spindle speed (max.): 4,000 rpm, travel distance X-axis: 190 mm, travel distance Y-axis: 575 mm, TECHNICAL DETAILS Turning Diameter: max. 300 mm Turning Length: max. approx. 550 mm Standard Turning Diameter: 276 mm Swing Diameter: max. 525 mm Distance Spindle Nose – Turret Face: 115 – 690 mm Travel X-Axis: 190 mm Z-Axis: 575 mm Counter Spindle Travel B: 585 mm C-Axis: 360° Main Spindle Speed Range: 35 – 4,000 rpm Drive Power: 22 kW Max. Torque: 351 Nm Spindle Nose: A2-6" Spindle Bore: 76 mm Max. Bar Capacity: 64 mm Chuck Diameter: max. 250 mm Counter Spindle Speed Range: 35 – 4,000 rpm Drive Power: 7.5 kW Max. Torque: 57 Nm Chuck Diameter: max. 150 mm Tool Turret Number of Tool Positions: 12 Tool Holder: VDI 40 Shank Diameter: 25 mm Drill Shank Diameter: 40 mm Turret Indexing Time: 0.2 / 0.6 s Driven Tools Speed Range: 25 – 4,500 rpm Drive Power: 3.7 kW Max. Torque: 35 Nm Feeds Rapid Traverse X/Z: 30 m/min Rapid Traverse C: 400 rpm Rapid Traverse B: 18 m/min Feed Range X/Z: 0 – 5,000 mm/min Feed Range C: 1 – 2,000 °/min MACHINE DETAILS Control: PC Fusion CNC 640 T Space Requirements & Weight Nwedjxb Aizopfx Amyoi Footprint: approx. 5.0 x 3.0 x 2.5 m Machine Weight: approx. 5.9 t Total Power Requirement: 34 kVA EQUIPMENT Documentation Chip Conveyor Coolant System Three-jaw Chucks 250 / 150 mm Tool Measuring Arm Driven Tool Attachment Extraction System 5x Fixed Tool Holders 2x Driven Tool Holders

Condition: excellent (used), Year of construction: 2000, CNC Lathe MAZAK SUPER QUICK TURN 200 Year of manufacture: 2000 Working area: Max. swing diameter: 525 mm Max. turning diameter: 350 mm Max. turning length: 514 mm Bar work up to max. diameter: 51 mm Main spindle: Speed range: 35 – 5,000 rpm Main drive power: 18.5 kW Constant torque: 333 Nm Spindle nose: A2 – 6 inch Spindle bore: 61 mm Turret: Standard version: 12 stations Travel: Turret travel: X-axis: 190 mm Z-axis: 535 mm Nwsdpfx Amoxvb E Deyji

Condition: used, Year of construction: 1996, turning diameter . mm turning length . mm control Mazatrol type . . turning speeds . U/min spindle passage . mm Tool changer . Pos. Spindle capacity . KW centre distance . mm x-travel . mm z-travel . mm weight of the machine ca. 4,75 t Super Quick Turn The tech. Data are manufacturer or operator information and therefore non- binding. We reserve the right to prior sale; Our terms and conditions of sale apply exclusively. About us More than 400 of our own machines in stock Over 15,000 m² of storage space, 70 t crane capacity More than 10,000 items and accessories for your workshop If you are interested in selling machines, production lines, or your business, Nwodpfx Ajyqr S Sjmyji please contact us. You can find further offers on our website. Tours are possible by appointment. We look forward to your visit. Your Markus Hirsch Team

Condition: used, Year of construction: 2003, Turning length 1000 mm Spindle bore 65 mm Max. turning dia. 300 mm Spindle speeds 4000 rpm Spindle speeds on live tools 4000 rpm Turret w/12 stations Control: Mazatrol 640 T Nexus Equipped with: 3 pcs. live tools Various tool holders Nodpfx Aox N A I Nomyswi

Condition: like new (used), Year of construction: 2023, operating hours: 2,763 h, functionality: fully functional, machine/vehicle number: 346574, turning length: 500 mm, turning diameter: 276 mm, spindle speed (max.): 4,000 rpm, rapid traverse X-axis: 30 m/min, rapid traverse Y-axis: 21 m/min, rapid traverse Z-axis: 33 m/min, bar diameter (max.): 80 mm, Equipment: rotational speed infinitely variable, The machine was commissioned in February 2024 and has 1,778 automatic hours. It has only been used for machining plastics and brass. The subspindle is equipped with a two-jaw chuck for holding workpieces for milling contours. The machine can be inspected under production conditions at any time. It is in like-new condition. Total investment including accessories: €241,000. Equipped with a 12-station turret, all driven. Sale EXW 91413 Neustadt, Germany. Nsdpfoynnhwox Amyswi

Condition: ready for operation (used), Year of construction: 2012, operating hours: 25,960 h, functionality: fully functional, machine/vehicle number: 238911, travel distance X-axis: 1,400 mm, travel distance Y-axis: 1,200 mm, travel distance Z-axis: 1,325 mm, table length: 800 mm, spindle speed (max.): 8,000 rpm, TECHNICAL DETAILS Travel range, X-axis: 1,400 mm Travel range, Y-axis: 1,200 mm Travel range, Z-axis: 1,325 mm Table area (L x W): 800 x 800 mm Spindle speed: 8,000 rpm Spindle torque: 1,218 Nm Tool changer positions: 80 MACHINE DETAILS Number of pallets: 2 Dimensions & Weight Dimensions (L x W x H): approx. 8,000 x 3,000 x 3,500 mm Weight: approx. 30,800 kg Operating Hours (according to image) Operating hours: 54,415 h Power-on hours: 30,498 h Cutting hours: 25,960 h EQUIPMENT Tool magazine for 80 tools, SK 50 DIN69871 Air blow-off device on the workpiece Nedpfxjzi Ai Ro Amyowi Interface for high-pressure cooling system 70 bar, Knoll Chip conveyor Preparation for Mazak Monitoring System B, optical probe type OMP60 Synchronized tapping Rapid traverse with constant pitch during angular movements 2-pallet changer Spindle with increased torque NC rotary table with 360,000 positions MAZAK Monitoring System B, optical probe type OMP60 Automatic tool length measurement

Condition: used, Year of construction: 2003, MAZAK NEXUS VCN 410A Year 2003 Travel in the X-axis: 560 mm Travel in the Y-axis: 410 mm Travel in the Z-axis: 508 mm Table length: 900 mm, Table width: 410 mm Tool magazine: 30 Spindle taper: CAT 40 Max. spindle speed: 12000 rpm Spindle motor power: 11 kW Nwodpfozpynkox Amyoi Documentation included Coolant tank with pumps

Condition: ready for operation (used), Year of construction: 2006, travel distance X-axis: 510 mm, travel distance Y-axis: 510 mm, travel distance Z-axis: 460 mm, controller manufacturer: MAZATROL, controller model: Matrix, table load: 300 kg, overall weight: 11,000 kg, spindle speed (max.): 3,000 rpm, spindle motor power: 22,000 W, number of slots in tool magazine: 60, number of axes: 5, This 5-axis Mazak VARIAXIS I 500 was manufactured in 2006. It features an X-axis travel of 510 mm, Y-axis travel of 510 mm, and Z-axis travel of 460 mm. The machine includes a tool magazine capacity of 60 tools and a maximum spindle speed of 12,000 rpm. If you are looking to get high-quality milling capabilities, consider the Mazak VARIAXIS I 500 vertical machining centre we have for sale. Contact us for further details. • A: -120° / +30° • C: 360°Table • Dimensions: 500 × 400 mm • Number of tables/pallets: 2 • Spindle nose to horizontal table: 190–650 mm • Spindle nose to vertical table: 140–600 mmSpindle • Max torque: 252 NmTool magazine / ATC • Automatic tool changer: YesControl and software functions Nwedpozpygasfx Amyji • Automatic pecking cycle with load detection • Synchronized tapping • EIA Dynamic Compensation 2 • Two additional M-code functions • G00 slope constant • High-speed function • MAZACC-3D high-speed software package • Shape compensation for rotary axes Additional equipment • Pallet changer (two pallets/tables) • Belt-type chip conveyor • Chip conveyor preparation with chip pan • High-pressure coolant through spindle system (stated as 15 kg)

Condition: used, Year of construction: 2010, Mazak VCN 510C-II (Vertical Center Nexus) With Mazatrol Matrix Nexus control, 12,000 RPM 18.5KW BT40 spindle, with tool setter and swarf conveyor. Due into Bristol in March 2026 when more pictures will be uploaded. Specification: Control System: Mazatrol Matrix Nexus Table Size: 1300 mm x 550 mm Nsdpfx Amjyh N Aaoyewi Maximum Table Load:1200 kg X-Axis Travel: 1050 mm Y-Axis Travel: 510 mm Z-Axis Travel: 510 mm Spindle Speed: 12000 RPM Spindle Taper: BT40 Spindle Motor: 18.5 kW Tool Storage Capacity: 30 tools (Standard) Tool Change Time (Chip-to-Chip): Rapid Traverse (X/Y/Z): 36 m/min Weight: ~ \(6900\) - \(7100\) kg Machine Dimensions 3870 x 2819 x 2842mm Control System: Mazatrol Matrix Nexus Specs: X 1050 Y 510 Z 510 / 12,000RPM / BT40 Accessories: Tool setter and swarf conveyor

Condition: excellent (used), Year of construction: 2019, MAZAK QUICK TURN 350MB 1250U Max. swing diameter: 830 mm Max. turning diameter: 420 mm Max. turning length: 1,250 mm Max. milling speed: 5,000 rpm Max. spindle speed: 3,300 rpm Machine is equipped with: - CNC control Mazatrol SmoothG - SMW three-jaw chuck KNCS 400, diameter 400 mm - Tool Eye Njdjy Igz Dspfx Amyowi - C-axis - NC tailstock - Reinforced coolant pump - Chip conveyor - 8 pcs. fixed tool holders - 2 pcs. driven tool holders

Condition: ready for operation (used), Year of construction: 2007, operating hours: 40,522 h, controller manufacturer: MAZATROL, controller model: Matrix, total height: 3,400 mm, overall weight: 17,000 kg, This 5 axis Mazak Variaxis 630-5X was manufactured in 2007. A universal machining centre featuring a 2-pallet changer, 80-tool magazine, and a Renishaw probe. It supports a 70 bar internal cooling system, enhancing operational efficiency. Ideal for those looking to enhance their machining capabilities. Contact us for more information about this machine. Nwjdpfxox D Ewaj Amysi • Spindle speed: 12.000 rpm • Known defects: Normal signs of use and wear • 80-tool magazine • Renishaw probe • 70 bar internal cooling Additional equipment • 2-pallet changer Dimensions Machine Depth 5800 mm

Condition: excellent (used), Year of construction: 2009, functionality: fully functional, MAZAK QUICK TURN NEXUS 250-II M 500U Max. machining diameter: 380 mm Nwjdpsznnl Ijfx Amyji Max. machining length: 504 mm Max. milling speed: 4,500 rpm Max. spindle speed: 4,000 rpm Max. bar diameter: 74 mm Machine is equipped with: - CNC control: Mazatrol Matrix - KITAGAWA 3-jaw chuck, B-210, diameter 254 mm - Tool Eye - C-axis - NC tailstock - reinforced coolant pump - chip conveyor, discharge to the side - 8 pcs. fixed tool holders - 2 pcs. driven tool holders

Condition: excellent (used), Year of construction: 2006, For sale: A reliable vertical CNC machining center Yamazaki Mazak Nexus VCN-510C – a high-end production machine from the renowned Japanese manufacturer MAZAK, known for its precision, durability, and stable operation in industrial manufacturing environments. The VCN-510C is ideally suited for machining steel, aluminum, and workpieces requiring high accuracy and repeatability. Thanks to the MAZATROL 640M control, the machine offers intuitive operation and rapid production setup. Technical specifications: Nedpfeyha Ivex Amyowi Year of manufacture: 2006 Control: MAZATROL 640M X-axis travel: 1,050 mm Y-axis travel: 510 mm Z-axis travel: 510 mm T-slot table Automatic tool changer (ATC) Central lubrication Electrical cabinet Weight: 7,100 kg Low operating hours

Condition: like new (used), Year of construction: 2018, functionality: fully functional, MAZAK QUICK TURN 250MY 1000U Max. turning diameter: 380 mm Max. turning length: 991 mm Max. milling speed: 5,000 rpm Max. spindle speed: 4,000 rpm Max. bar diameter: 80 mm Machine is equipped with: - CNC control Mazatrol SmoothG - KITAGAWA three-jaw chuck BB-210, diameter 254 mm - Tool Eye - C-axis - Y-axis - NC tailstock - Reinforced coolant pump Nedpfxoyllrnj Amyewi - Chip conveyor - 8 static tool holders - 2 driven tool holders

Condition: like new (used), Year of construction: 2022, operating hours: 4,747 h, functionality: fully functional, machine/vehicle number: 329760, travel distance X-axis: 1,050 mm, travel distance Y-axis: 530 mm, travel distance Z-axis: 510 mm, This machine can still be inspected while powered on at the factory. It has very few operating hours and is in like-new condition. Used CNC vertical machining center, Manufacturer: MAZAK Model: VCN 530 C SmoothG Machine number: 329760 Operating hours: 4747 The tools, fixtures, and vise are not included in the scope of delivery. You will find the order confirmation and machine specifications in the attachment. Nedpozpzq Hsfx Amyowi

Condition: good (used), Year of construction: 2007, functionality: fully functional, turning diameter: 545 mm, spindle speed (max.): 12,000 rpm, travel distance X-axis: 410 mm, travel distance Y-axis: 140 mm, travel distance Z-axis: 570 mm, Equipment: chip conveyor, The MAZAK Integrex 100-IV is a compact and highly precise CNC turning and milling center designed for complete machining of complex workpieces in a single setup. Thanks to the combination of turning and milling functions, as well as the integrated B and Y axes, the machine is particularly suitable for demanding precision parts in the medical technology, mechanical engineering, and precision engineering industries. The machine was manufactured in 2007 and is equipped with the powerful MAZATROL Matrix control. This enables both dialog-oriented and ISO programming and offers modern functions for efficient and productive manufacturing. Key technical data: The travels are 410 mm in the X-axis, 140 mm in the Y-axis (±70 mm), and 570 mm in the Z-axis. The B-axis has a swivel range of 225°, enabling complex 5-axis machining. The C-axis of the main spindle operates with a high positioning accuracy of 0.001°. The maximum turning and swing diameter is 545 mm each. The main spindle reaches speeds of up to 6,000 rpm with a power of approximately 11 kW, which enables dynamic and precise turning operations. The integrated milling spindle operates with speeds of up to 12,000 rpm with a power of approximately 5.5 kW and is ideally suited for milling, drilling, and threading operations. The machine features a tool changer (available) with a maximum tool length of 210 mm and a KM tool holder, which ensures high rigidity and fast tool changes. Equipment: The equipment includes: • Chip conveyor • Tool measurement system "Tool Eye" Nwjdpfozpyvhsx Amyoi With a machine weight of approximately 5,040 kg, the Integrex 100-IV impresses with its compact design, high precision, and flexibility – ideal for economical complete machining in modern production environments. You are in the best hands with us – professional, reliable, and with a passion for machines! Necoyir I Rs Eanhd Held PS CNC Service Germany GmbH & Co. KG All information is subject to change without notice.

Condition: excellent (used), Year of construction: 2013, MAZAK QUICK TURN NEXUS 250-II MS Max. machining diameter: 380 mm Max. machining length: 504 mm Max. milling speed: 4,500 rpm Max. spindle speed: 4,000 rpm Max. bar diameter: 74 mm Nwodpezpw Eysfx Amysi Machine is equipped with: - CNC control: Mazatrol Matrix Nexus 2 - KITAGAWA 3-jaw chuck, diameter 254 mm - KITAGAWA 3-jaw chuck, diameter 200 mm, tailstock - Tool Eye - C-axis - automatic parts catcher - C-axis tailstock, input accuracy 0.0001° - Interface for bar loader magazine - automatic parts catcher - parts retrieval device - chip conveyor - LNS QuickLoad bar loader magazine (currently out of operation) - 8 pcs. fixed tool holders - 4 pcs. driven tool holders