Draper expert 50mm 14 square drive satin chrome plated extension bar draper expert 9916 expert quality wobble end manufactured from chrome vanadium steel hardened tempered and satin chrome plated for corrosion protection hexagon ended and knurled for easy grip display packedmanufactured and tested generally in accordance with din3122 and iso3315 specifications draper expert 9916 50mm 14 square drive satin chrome plated extension bar