Draper expert 250mm 1 2 square drive sliding tee bar draper expert 13256 b i expert quality i b manufactured from chrome vanadium steel hardened tempered and chrome plated for corrosion protection spring loaded ball bearing for secure socket holding sold loose br br b manufactured and tested generally in accordance with din3122 and iso3315 specifications b br br draper expert 13256 250mm 1 2 square drive sliding tee bar