Simpson 16d x 3 1/2" 20 - 22 Degree Collated Ring-Shank Nail, 316 Stainless Steel 10 Ga.Model No. T10A350CN Coating Material. Type 316 Stainless Steel Gauge. 10 Penny size. 16d Length (in.) 3 1 2 Head Diameter (in.) 2 7 Shank Diameter (in.) 1 8 Shank Type. Annular Ring Shank Head Type. Full Round Head Head Pattern. Checkered Point Type. Diamond Point The 20 22 plastic strip, full round head, ring shank nail features a checker pattern on the head that blends with wood grain, reduces sunlight glare and accepts surface finishes. This nail