AS-Drive 1/2" (12.7 mm) long impact socket set. Includes 10 1/2" hexagonal sockets in sizes: 10, 12, 13, 14, 15, 17, 19, 22, 24, 27 mm CrMo forged chrome-molybdenum steel sockets Surface hardened, phosphated and blackened for durability and corrosion protection Hardness: 43-47 HRC packed in a case **