Simpson 16d x 3 1 2" Dark Brown Painted Siding Nail, 304 Stainless Steel PACK:5 Lb (440) Hot dip galvanized (HDG) finish Hot dip galvanized (HDG) finish provides extra corrosion resistance suited to exterior environments and applications involving treated lumber Built for the harshest structural demands the engineered gusset angle is specifically designed to handle the lateral and uplift forces generated in high wind events and seismic zones Annular ring shank delivers superior grip versus smooth shank alternatives the ring shank mechanically locks into wood fibers Full round head with 1 4" head diameter distributes holding force across the siding face while keeping the head profile low and unobtrusive on the finished wall