• Maximum Drill Chuck Capacity (Inch): 5/8" • Minimum Drill Chuck Capacity (Inch): 0 • Mount Type: Taper Mount 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.