Type Quick Change Tools Kit Tool Post Tool Holder for Lathe Tools Change Tools. Accuracy: designed to ensure repetitive accuracy. Quickly and easily installed on a lathe engine, bench or tower for a wide range of operations. Size stud M-10 and perfect for most mini machines, although modifications may be necessary for some machines (sleeve or a new center rod for a smaller hole may be necessary). Reduce installation time: instant change from one operation to another. All working parts are accurate and hardened. Completely sealed for maintenance-free work. Rotate: the unequaled rigidity of this pillar of tools and holders ensures smoother turning without chatter or vibration. Drilling: allows you to drill with the power of your carriage, instead of manual work or tailstock. Hard cuniform tool post design, easily centered. Usage: CNC machine tool accessories. Type: 250-000, 250-001, 250-002, 250-004, 250-007, 250-010 (optional). Capacity of the tool. 250-000: 1/2 cuniform type tool post. 250-001: 1/2 turning tool holder. 250-002: 1/2 boring, turning tool holder. 250-004: 3/8″ and 1/2″ heavy duty boring bar holder. 250-007: 1/2 parting blade tool holder. 250-010: 1/2 knurling and turning tool holder. Package size: 145 80 55mm / 5.7 3.1 2.2in. 250-001: quick tool change holder for lathe cutting tool bits, range up to 1/2 inch. This holder is suitable for working with cuniform type 250-000. 250-002: V groove hold round shank boring bars and tools as well as square tool bits to machine end face, external, cutting, boring, etc. 250-004: use straight shank drilling and reaming, boring, etc. Equipped with a split bushing to accommodate a boring bar of small diameter. It grips with extreme rigidity. Cuts smoothly without chatter. 250-007: use square tool to make slot cut off etc. 250-010: it may be used for knurling, if square tool is used, it may process end face, extered cutting, boring etc.