Stanley J155/8S2 Proto 5/8-inch x 3/16-inch Long Aligning Punch Application: to align holes in two or more pieces of metal through which a bolt or screw is to be inserted. One-piece design for strength and durability. Reverse taper to help prevent binding. Made from S2 steel and specially heat-treated for greater strength and durability. Modified parabolic striking end to help reduce mushrooming and chipping. Black oxide finish to help prevent rust corrosion; extending tool life and performance. A polished identification panel on one of the flats is marked with the tool number and size in a black inlay.