These Osborne setting dies are made of superior-grade steel. Use for setting #4 plain grommets and tooth washers by hand.
Product Note: Setting dies are guaranteed against defects in material and workmanship, but this guarantee is not intended to cover tools against wear and tear, over-strain, and steel hammering. To achieve maximum life of tools, use a rawhide mallet or maul, dead blow hammer, and urethane cutting pad. Strike at a 90-degree angle.