Elora Deep Bi-Hexagon Socket, 1/2"" Sq. Dr., 17mm. Professional Quality, sockets manufactured from chrome vanadium steel hardened, tempered and chrome plated for corrosion protection. Chamfered end allows positive nut location and entry. Hole for driving accessory spring-loaded ball. Overall length 80mm. Sold loose. Manufactured to DIN 3124/ISO 2725 Specifications. Type: Deep bi-hexagon socket. Material: Chrome Vanadium Steel. Size: 17mm.