Simpson 1 1/4" x 0.12 Smooth-Shank 15° Wire Coil Roofing Nail, 304SS 7200PkModel No. S11N125RNB Coating Material. Type 304 Stainless Steel Gauge. 11 Penny Size. 3d Length (in.) 1 1 4 Head Diameter (in.) 3 8 Shank Diameter (in.) 0. 12 Shank Type. Smooth Shank Head Type. Full Round Head Head Pattern. Smooth Head Point Type. Diamond Point Packaging Qty. 7200 The 15 Wire Coil, Full Round Head, Smooth Shank Roofing Nail is ideal for asphalt and synthetic slate roofing, these smooth shank nails feature a large flat head and