Knipex Diagonal Cutters – Forged Steel 6 1/4″. The 6 1/4″ Diagonal Cuttersoffer a 20% higher cutting force than previous models featuring longer cutting edges and a narrow head for better access in confined areas. These cutters are made from vanadium steel forged and multi-stage oil-hardened ensuring a long tool life and high loading capacity. They are equipped with induction hardened cutting edges (approx. 62 HRC) and a strong precision rivet for even movement and extended service life.