Cementex double-insulated 1000V-rated bolt cutters are industrial grade center cut cutters. Drop-forged, precision ground, alloy tool steel jaws with center-cut blades. Maximum hardness of material to be cut: Brinell 455/Rockwell C48. Lockplate keeps jaws from loosening. Toogle joint turns 50 lbs. hand pressure to 4000 lbs. cutting pressure. Screw-type adjustment realigns edges.