For cutting soft and medium hard materials up to Brinell 300, Rockwell C31 hardness. Center cut jaws for use where flush cuts are not required. Alloy tool steel drop-forged jaws, precision ground and heat-treated for extra long cutting life. High-tech, precision cast, aircraft grade aluminum handles provide high-strength at half the weight of traditional bolt cutters. Not for use on hard steel, reinforcing rod, hard bolts, stainless steel, hard wire rope, or tempered spring wire.