H1/4" Hex Auto Lock Insert or quick release bit holder 1.quick release 2.S2 material 3.different size H1/4 ... " Hex Auto Lock Insert or quick release bit holder (screwdriver bits, bits holder)Application:DIN ... steel bits.Suitable for: DIN 3126, ISO 1173, style D 6.3 + F 6.3 and double bits ... : Metal, coated.Drive: DIN 3126, ISO 1173, style E 6.3.Application: Whenever the bit needs a ...