Grizzly H6265 4 Jaw Wood Chuck, 1-Inch This 4-jaw self-centering chuck with dovetailed jaws is great for small bowl and plate turning and features jaws that grip by clamping around the work The minimum diameter required for clamping around the work piece is 1-1/4-Inch and the minimum diameter required for expansion is 1-13/16-Inch Includes t-handled wrenches wood screw point and machined chuck lever