Simpson Strong Tie T8PCS1 8d Fiber-Cement Siding Nails 2-1/2-Inch 11 Gauge 316 1-Pound Stainless Steel Most sizes available in 1 and 5 pound boxes Checker head pattern blends with wood grain Annular ring shank increases hold Applications include various lap and panel siding materials made of fiber-cement composites Diamond Point for easy driving