Draper expert 1 4 square drive universal joint draper expert 12452 b i expert quality i b manufactured from chrome vanadium steel hardened tempered chrome plated and polished for corrosion protection head swings through 90 176 in both directions 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 12452 1 4 square drive universal joint