Simpson 7d - 2-1/4" Shake and Shingle Siding/Roofing Nail, 316 Stainless SteelModel No. T7SN7 Coating Material. Type 316 Stainless Steel Gauge. 13 Penny size. 7d Length (in.) 2 1 4 Head Diameter (in.) 2 9 Shank Diameter (in.) 0. 092 Shank Type. Annular Ring Shank Head Type. Full Round Head Head Pattern. Checkered Point Type. Diamond Point Approx. Count per Lb. 216 The Shake and Shingle Siding Roofing nail's 7 32" diameter flat head provides ample bearing surface to secure all types of shakes and shingles. This screw also