This punch should be used on a wood or plastic cutting block or the #603 Cutting pad. The use of wood or rawhide mallet is recommended. Steel hammers are not recommended. Osborne arch punches are drop forged in one piece from the finest special carbon steel in sizes from 3/16-inch diameter. Larger sizes are made with properly engineered two-piece welded construction. A unique feature of the Osborne arch punch is the inside taper which permits the punchings to clear easily through the barrel. Punches have a fully polished barrel and black enamel handle. The cutting edge is fully hardened all the way through and properly finished to provide long use and trouble-free punching. There is no other hollow punch that can compare. These arch punches meet government standards.