Draper expert 250mm 1 2 square drive sliding tee bar in display pack draper expert 27531 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 display packed br br b manufactured and tested generally in accordance with din3122 and iso3315 specifications b br br draper expert 27531 250mm 1 2 square drive sliding tee bar