Osborne Arch Punches are forged in one piece from the finest special carbon steel in sizes from 2MM to 60MM diameter. Larger sizes are made with our 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 fully polished barrel and a green enamel finish. The cutting edge is fully hardened all the way through and properly finished to provide long use trouble free punching. There is no other hollow punch that can compare.