Universal Bit Holder Adaptor, for PrecisionBits C 6.3 (1/4") • stable body, securely connects PrecisionBits with electric screwdrivers and drills • stainless steel bit holder with a strong magnets, locks PrecisionBits in position and holds screws in place • hexagonal connection made from a special alloy based on spring steel, hard and tough for a long service life • laser-marked serial number, lifetime guarantee