Tekton 1/4 inch drive external star (E-Star) sockets are made from 50BV30 steel that's hardened to 40–47 HRC for strength and durability. The socket is protected against corrosion with chrome plating on the outside and clear coat on the inside. The socket has large, stamped markings that are permanently impressed into the material by a roll-stamp die and are as large as possible while still being readable along the socket's curved surface. Detent grooves and beveled edges provide a smooth and secure connection with the drive tool. This set includes socket rail organization with twist-to-lock clips.