The Vulcan hex bit socket are made for the most demanding professionals, each of our bit sockets is made from custom chrome vanadium premium steel that underwent proprietary heat treatment and precisely machined to perform in toughest situations. The premium steel forged bits are exceptionally strong and durable. These steel bit sockets withstand high torque and do not twist, protecting both the bit and the fastener. Chamfered end to ensure a smooth fit onto fasteners.