The Gearwrench X-Core Pinless Universal Impact Sockets offer a four-lug ball-and-socket design with 360 degree movement to quickly remove stubborn fasteners. The design allows a 30 degree off-center operating angle for improved access in tight spots. Each socket is made with chrome molybdenum construction, corrosion resistant black-oxide coating and a turned up socket base for grip when changing. Each socket set is packed on a plastic socket rail. Sizes are hard-stamped into the side wall of the socket for easy identification.