Hexagon socket screw (conical) Pro Bolt Made of 316 stainless steel, the following advantages: - excellent strength - excellent corrosion resistance - high resistance to acids The offered stainless steel screws are all polished to high gloss. Stainless steels are iron alloys with a minimum of 10.5% chromium added with other elements (nickel, molybdenum, titanium, copper, carbon, nitrogen) to enhance properties such as moldability and strength. A chrome-rich oxide layer gives stainless steel its corrosion resistance. Package content: 5 pieces