Knipex Diagonal Cutters - Forged Steel 6 1/4"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