Bostitch C5R90BDSS 1-3/4-in 15 Degree Stainless Steel Coil Siding Nails (3,600 pk) Fits N63CP, N64C, N66C, and N66BC All of our Stainless Steel fasteners are manufactured with type 304 Stainless Steel, the most common in the industry, and it meets the requirements of ASTM F1667 Stainless Steel assures longer fastener life, especially if the nail heads will be left exposed to the weather