6-point Impact hex sockets specifically forged for use on powered impact tools. Precision cold-forged, hardened and tempered chrome vanadium steel. Clear laser-etched sizes and industrial phosphate-coated for tough corrosion resistance. Thick walls provide strength and durability for repetitive high torques. Side wall hole for ball or pin locking to the tool. Contents: 10, 11, 12, 13, 14, 15, 17, 19, 21 and 22mm.