Bi-hexagon. (12 point). This range of 1" (25mm) series sockets is the ultimate for high torque hand applications. The Bi-hexagon design gives strength and reliability under heavy loads. Used extensively in heavy plant, rail, shipyard and oil rig industries. The 12 point bi-hexagon side drive design gives a higher torque than normal sockets. Made from chrome vanadium, fully chrome plated with a mirror finish and aluminium-free. Chamfered leading edge ensures easy fastener location.