Simpson 2 1/2" Annular Ring Shank Post and Beam Nail, 304 Stainless Steel 11 Ga. 5LbModel No. S8APB5 Coating Material. Type 304 Stainless Steel Gauge. 11 Penny size. 8d Length (in.) 2 1 2 Head Diameter (in.) 1 4 Shank Diameter (in.) 0. 12 Shank Type. Annular Ring Shank Head Type. Full Round Head Head Pattern. Checkered Point Type. Diamond Point Approx. Count per Lb. 5 Lb (575) The Simpson Annular Ring Shank Post and Beam Nail features an annular ring shank and checker pattern on heads to blend with wood grain, reduce sunlight glare