Maximum Drill Chuck Capacity Inch 12 Minimum Drill Chuck Capacity Inch 364 Mount Type Taper Mount Mounting Size JT6 Bearing Type Plain Bearing GS Plain Bearing Chucks are specially designed for stationary drilling, turning, milling, and woodworking machines Sleeve design eliminates the possibility of tooth breakage Hardened jaws and body help to avoid wear and lengthen the life of the chuck Each chuck supplied with a key