This Osborne arch punches is drop forged in one piece from the finest special carbon steel in 1-3/4" diameter. A unique feature of the Osborne arch punch is the inside taper which permits the punchings to clear easily through the barrel. Punches have fully polished barrel. The cutting edge is fully hardened all the way through and properly finished to provide long use trouble free punching. These punches should be used on an Osborne #603 Cutting pad. The use of an Osborne wooden mallet or rawhide hammer is recommended. Meets Government Standards. STEEL HAMMERS ARE NOT RECOMMENDED!