Titan Tools 15659 3/8-inch drive x 5/16-inch hex bit socket is built to last and get the job done. The 3/8-inch drive socket is constructed of strong chrome plated chrome vanadium and the 5/16-inch hex bit is constructed of durable S2 alloy steel. Detent notches in the drive end provide secure retention of ratchets and extensions. This hex bit socket is made in Taiwan.