Simpson 1-3/4" x 0.12 Ring Shank 15° Wire Coil Roofing Nail, 304 Stainless SteelCoating Material. Type 304 Stainless Steel Gauge. 11 Penny Size. 5d Length (in.) 1 3 4 Head Diameter (in.) 3 8 Shank Diameter (in.) 0. 12 Shank Type. Annular Ring Shank Head Type. Full Round Head Head Pattern. Smooth Head Point Type. Diamond Point The 15 wire coil, full round head, ring shank roofing nail combines the short term benefit of increased fastening efficiency with the long term benefit of stainless steel. This nail is ideal for fast driving