Draper expert 12 square drive bi hexagon hi torq sockets draper expert 11879 expert quality 12 point sockets manufactured from chrome vanadium steel hardened tempered chrome plated and polished for corrosion protection chamfered end allows positive nut location sold loosemanufactured and tested generally in accordance with din3122 and iso3315 specifications6 point sockets draper expert hi torq174 is a registered trademark of draper tools ltd draper expert 11879 17mm 12 square d