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Simpson #6 x 1/2" Flat Head, 316 Stainless Steel Marine Screw PACK:100 Pk What type of corrosion protectionSimpson #6 x 1 2" Flat Head 316 Stainless Steel Marine Screw by Simpson Strong Tie is engineered specifically for boat building and marine trade applications where extreme corrosion resistance is non negotiable. Crafted from Type 316 stainless steel the grade known for its superior resistance to saltwater, harsh chemicals, and caustic marine environments this flat head screw fastens securely in fiberglass, plywood, and wood substitute materials.