Steel bar shear blade's feature: Above 3-5 times life of normal bit Carry on the pre-protection and repair Flies shear knives are specially heat treated for optimum toughness and abrasion resistance to make them highly resistant to damage, impact, vibration, clamping and cutting force. Files shear knives's life are above 3-5 times of the overall alloy tool steel bit , and may carry on the pre- ...