Quick and easy to install. Precision ground and hardened. Completely sealed for maintenance free operation. Maximum rigidity for chatter free performance.Turning and facing tools can be locked together. Suitable for a wide range of operations, from fine precise work to heavy duty cutting. Use for lathe swing 6-12 inch piston Type or wedge type tool posts sets Boring Turning Facing Holder #1 250-101 : Tool bit capacity: 3/16 - 1/2 inch Boring Turning Holder #2 250-102: Tool bit capacity: 3/16 - 1/2 ,Round Boring Bar Shank Diameter: 7/16 For use with tool post 250-100 or 250-111. up to 12 inch swing Model: 250-101,250-102 Material: high speed steel Color: Black Lathe swing: Up to 12inch Size: 7.6*3.3cm Package Contents: 2* Turning & Facing Tool Holder Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.