13-Piece Long Hex Key wrench Set.Heat treated chrome vanadium steel with black oxide finish. Chamfered ends for fast, precise insertion and reducing the chance for stripping the fasteners.Sizes included:3/64",1/16",5/64",3/32",7/64",1/8",9/64",5/32",3/16",7/32",1/4",5/16", 3/8"