The Simpson Strong-Tie® Roofing Nail – Annular Ring Shank was designed to optimize holding power, while incorporating higher levels of corrosion resistance. Its large flat head provides extra bearing surface to firmly secure roofing material and its annular ring shank increases withdrawal resistance. A variety of sizes are available in Type 316 and Type 304 stainless steel. Roofing Nail, Annular Ring Shank — 2 in. x .120 in. Type 304 Stainless Steel (25 lb.) (Pack of 64).