Simpson 20d x 4" Preservative-Treated Wood Decking Nail, 316 Stainless Steel Grinders 56/18 is finished with a

56/18 is finished with a Zinc Galvanized G90 coating

81 can be positioned higher or lower on the ridge beam

Blade changes are made simple by the one piece blade cover design

Annular-ring shank (ring shank) - the grooved shank locks into wood fibers to significantly increase withdrawal resistance

Simpson 20d x 4" Preservative-Treated Wood Decking Nail, 316 Stainless Steel Grinders 56/18 is finished with aSimpson 20d x 4" Preservative Treated Wood Decking Nail in Type 316 Stainless Steel is a heavy duty exterior fastener engineered for deck and dock construction where long term performance in harsh outdoor conditions is essential. Built by Simpson Strong Tie, this annular ring shank nail is purpose designed for use in both green and seasoned preservative treated pine, delivering the corrosion resistance and withdrawal strength needed to keep outdoor