Material: The chuck is made of chrome vanadium steel, which has high hardness, wear resistance, durability and long service life after heat treatment. Capacity Range: 1.5 - 13 mm/0.06-0.5 inch, Threaded Spindle/Spindle Holder: 1/2"-20UNF. Multiple Accessories: 1/2"-20UNF threaded chuck equipped with a 1/2" square female socket adapter, a 1/4" hex shank and an SDS shank to allow the converter to quickly connect different drive tools. Widely Applicable: The chuck is suitable for gyro screwdrivers, cordless screwdrivers, impact screwdrivers, impact wrenches, angle grinders and other electric or pneumatic tools. Caution: The chuck must not be used counterclockwise! When using a hammer drill chuck, the hammer drill gear must be adjusted. Incorrect gearing will cause the chuck to break!