Draper expert 1 4 square drive satin chrome plated universal joint draper expert 9917 b i expert quality i b manufactured from chrome vanadium steel hardened tempered and satin chrome head swings through 90 176 in both directions screwed joints to enable tightening and increase working life display packed br br b manufactured and tested generally in accordance with din3122 and iso3315 specifications b br br draper expert 9917 1 4 square drive satin chrome plated universal