8PC SHOCKWAVE™ Impact Duty 3/8" Drive SAE Deep 6 Point Socket Set. It is made of chrome molybdenum steel for strength and durability. The sockets have a black oxide finish for corrosion resistance. The set includes the following sizes: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", and 11/16".