Maximum Drill Chuck Capacity Inch 12 Minimum Drill Chuck Capacity Inch 0 Mount Type Taper Mount Mounting Size MT3 These chucks provide exceptionally high torque up to three times the gripping strength of conventional drill chuck taper holder combinations The design eliminates any possibility of chuck holder misalignment, and it assures separation safety High precision, premium tolerance The jaws feature a TIN coated surface treatment to assure durability