Professional Quality, tested to 10, 000V & insulated to 1000V AC & 1500V DC for live line working. Manufactured from vanadium steel, oil hardened & tempered. Smoothly ground cutting edges separately induction hardened to 61HRC for cutting medium 3.2mm & hard wire 2.2mm. Straight, half round jaws have serrated gripping surfaces. Heavy insulated handles with slip guards for extra comfort & safety.