Krenn R-Series Heavy-Duty Bolt Cutters are specifically designed for high carbon steel, spring grades and exotic metals. They feature replaceable three-sided cutting blades, giving you three times the life of conventional bolt cutters. Replaceable blades eliminate the need to replace cutter heads when blades wear out. Manufactured with heavy duty forged bodies to hold up in tough factory Use. Cutting blades are made from chrome vanadium steel and hardened to 60HRC. Internal stop safely eliminates overcutting.