This Grip-Rite 16D 3-1/4 in. Sinker Vinyl Steel Nail Countersunk Head is ideal for a variety of applications including fastening wood to concrete, attaching vinyl siding and many other general applications. The steel nail is galvanized for added durability and has a countersunk head for a flush finish. Grip-Rite Sinker Nails are best used for general construction, carpentry, and framing.