These knipex 28 01 series assembly pliers are made from special tool steel and have pvc dipped handles for added comfort durability and most importantly added grip the oil hardened and tempered construction will give these pliers a longer working life they have separately induction hardened cutting edges that are hardened to approximately 60hrc these pliers are specially suitable for gripping and assembly work with a higher prehensile power they are equipped with hardened cutting edges with serr