Draper expert 75mm 12 square drive chrome plated wobble extension bar draper expert 9928 expert quality manufactured from chrome vanadium steel hardened tempered and satin chrome plated for corrosion protection enables sockets to be driven at up to 15176 to the vertical hex end and knurled for extra grip overall lengths can vary in production display packedmanufactured and tested generally in accordance with din3122 and iso3315 specifications draper expert 9928 250mm 12 square d