Quick and easy to install.Securely holds 3/16 - 1/2inch diameter tool bits. ground and hardened. Completely sealed for maintenance free operation. Maximum rigidity for chatter free performance.Turning and facing can be locked . For with tool post 250-100 or 250-. Suitable for a wide range of operations, from fine precise work to heavy duty cutting. : 250-101 Lathe swing: Up to 12inch Tool bit capacity: 3/16 - 1/2inch colour: black Material: metal size: 7.6x3.3cm Package Contents: 1 * Holder Quick Change Tool Note: Only suitable for piston type Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.