Protects around seals, stairs, and doorways. Heavy-gauge metal construction. Nail in place. Nails included. 3/4" x 12'. Aluminum seam binding. Carpet metal installation on concrete surface suggestion: Drill a hole in the concrete, insert a 3/16" x 1-1/4" or 1/4" x 1-1/4" wood dowel. Use the screw nails provided with carpet metals, insert into dowel, expanding the dowel to lock in place.