NOKE NK Clamp. Larger cover width (13 mm) for greater strength. Screw with head diameter of 9 mm to obtain greater resistance at the opening. Base 10% bigger for greater support of the tube. Prefixed system of the patented tube. Base and lid nerves marked for greater resistance. Greater resistance to corrosion. Zinc plated in electrical measurements (Ø25). Unit price (minimum order: 100 units).