Simpson 6" Annular Ring Shank Post and Beam Nail, 304 Stainless Steel 6 Ga. 25LbModel No. S60APBB Coating Material. Type 304 Stainless Steel Gauge. 6 Penny size. 60d Length (in.) 6 Head Diameter (in.) 7 16 Shank Diameter (in.) 0. 203 Shank Type. Annular Ring Shank Head Type. Full Round Head Head Pattern. Checkered Point Type. Diamond Point Approx. Count per Lb. 25 Lb (425) 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