Material :
Chrome vanadium steel, chrome-plated.

Version :
Forged from high quality steel, internally bevelled for easy fitting to bolt heads. Internal square to DIN 3120. The Surface Drive socket allows a tighter fit and higher effectiveness. The pressure works directly on the faces of the nuts and bolts; weaker corners are protected. Intermediate sizes e.g. in inches (A/F, BSF, BSW) and rounded heads can be tightened or loosened using the Surface Drive.