Chrome Plated 18-8 Stainless Steel. The same fasteners used by today's OEM Boat ManufacturersHolds up better than 18-8 or 316 SS aloneMore cost effective than Chrome plated 316 SSFantastic bright silver mirror finishMatches other chrome hardware on the boatVirtually eliminates future corrosion problems©exceeds 1,500 hours in a salt spray both