1/8 C.S. Osborne Arch Punch. Osborne arch punches are drop forged in one piece from the finest special carbon steel. Punches have a fully polished barrel and black enamel handle. The cutting edge is tempered all the way through and properly finished to provide long use trouble free punching. - 1/8 C.S. Osborne Arch Punch 1/8" C.S. Osborne Arch Punch (149-18)