Simpson 7d x 2 1/4" Annular Ring Shank Box Nail, 304 Stainless Steel, 25LbModel No. S7ABNB Coating Material. Type 304 Stainless Steel Gauge. 12 Penny size. 7d Length (in.) 2 1 4 Head Diameter (in.) 1 4 Shank Diameter (in.) 0. 113 Shank Type. Annular Ring Shank Head Type. Full Round Head Head Pattern. Checkered Point Type. Diamond Point Packaging Qty. 25 Lb Simpson Annular Ring Shank Box Nails are available in type 316 and 304 stainless steel. Choose type 316 for seaside applications and superior corrosion resistance. Key