The ATD Tools 19-pc 1/2" Drive 6-Point SAE Deep Impact Socket Set, No. ATD-44419, is made of high-quality chrome-moly steel and is heat-treated for strength and durability. Sockets include: 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 1-1/16", 1-1/8", 1-3/16", 1-1/4", 1-5/16", 1-3/8", 1-7/16", and1-1/2".