Knipex pipe pliers 8411, 200 Knipex 8411 is made of special tool steel, forged, oil-hardened, and black atramentized. The head is polished, and the handles are coated with plastic. The jaws feature recesses of Ø 6 and 10 mm, designed for very narrow screw connections.,Knipex pipe pliers 8411, 200 Knipex 8411 is made of special tool steel, forged, oil-hardened, and