US PRO INDUSTRIAL for professionals. This 6-piece socket set is designed for impact use and features 1/2" drive spline bits. Made from heat-treated, hardened, and tempered chrome-molybdenum steel with an industrial black phosphate finish, these sockets are suitable for all air-powered and battery-powered impact tools. The set includes shallow and deep sockets with sizes M14, M16, and M18, each measuring 78mm in length. Additionally, there are M14, M16, and M18 sockets measuring 40mm in length. Each socket has a drilled end for retaining ball bearings, making them compatible with ratchets and breaker bars. The set is supplied in a convenient blow-molded storage case.