Maximum Drill Chuck Capacity Inch 14 Minimum Drill Chuck Capacity Inch 164 Mount Type Threaded Mount Mounting Size 3824 Keyless chucks are engineered to quickly loosen and tighten a tool on the chuck collar of the drill, either by manual operation or when torque is applied Rotating the chuck collar in a counterclockwise direction will loosen the tool High precision, premium tolerance The jaws feature a TIN coated surface treatment to assure durability