JMP vent powered by Pro Bolt Made of 316 stainless steel which offers the following benefits: - Excellent strength - Excellent corrosion resistance - High acid resistance The stainless steel screws are offered all mirror polished. Stainless steels are ferrous alloys with a minimum of 10.5% chromium, with the addition of other elements (nickel, molybdenum, titanium, copper, carbon, nitrogen), in order to increase properties such as moldability and resistance. A chromium-rich oxide layer gives rustproof its corrosion resistance. Content: 1 piece