for safe driving out or through of rivets, pins, bolts or fasteners, cylindrical mandrel of highest hardness and toughness, extremely hard-wearing, re-tempered impact head, prevents splintering according to standard specifications, round, knurled shaft, safe hold in wet or oily environment, special alloy based on spring steel, exceptional elasticity with high hardness, laser-inscribed with serial number, lifetime warranty, when working with impact tools observe safety regulations: www.pbst.chsafe