Manufactured from 316 Stainless Steel these high quality Flanged Hex Head Bolts from Pro-Bolt offer superior strength and corrosion resistance. They also feature a dished out head with a captive washer (flange). These bolts are buffed to a mirror finish, absolutely no polishing is required. Material Specification: 316 Stainless Steel Stainless Steels are iron alloys with a minimum of 10.5% chromium with other elements (Nickel, Molybdenum, Titanium, Copper, Carbon, Nitrogen) added to enhance properties such as formability and strength. But it is the chromium-rich, oxide film that gives the corrosion resistance of stainless steel. This protective film is strong and chemically stable (i.e. passive) where there is sufficient oxygen on the surface. This strong protective film is extremely thin and will usually self repair if sufficient oxygen is available. Under certain conditions the passive state can be broken down and corrosion can result. Application: 316 stainless ste