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. 250-000: 739g / 1.6lb. 250-001: 159g / 5.6ounce. 250-002: 157g / 5.5ounce. 250-004: 367g / 12.9ounce. 250-007: 243g / 8.6ounce. 250-010: 271g / 9.6ounce. 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. 1 Tool Post / Tool Holder.