TEMO H-19 3 inch (76mm) Long Hex Hexagon Black Impact Bit Socket 1/2 inch (12.7mm) Square Drive Auto Repair Tool GC Impact Hex Socket Bit H19 mm The socket bit is 3-1/8" (80mm) long. 1/2" (12.7mm) Sqaure Drive with drive release holes. Drop forged black chrome moly steel (CR-MO). Industrial grade quality. Suitable for air tools and electric tools.