Klein pliers are made of the finest US steel alloy. They are forged, precision machined, hardened and carefully tempered for maximum strength. Klein pliers provide exceptional performance and durability. All pliers mating surfaces and dimensions are precision machined for faultless performance. Pliers halves are precision machined and hot riveted for uniformly smooth opening and closing action. Cutting knives are manufactured for long-lasting edges and perfect alignment. The cutting knives on all Klein pliers are designed to meet according to the way each is used. Side-cutting and long-nose pliers with side cutters have knives that meet at the hinge first and then meet at least one-half of the knife length. Diagonal-cutting pliers meet at the tip first and then meet at least one-half of the knife length. These precise knife-closing designs increase knife life and facilitate resharpening. Klein pliers are individually adjusted to meet performance standards far exceeding application requirements - ensuring that nothing less than outstanding quality ever carries the Klein name.