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, made of octagonal steel, for safe handling, 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