Durable aluminum trim with the look of hardwood in oak or cherry finish, for transitioning from carpeted to flat flooring. Protects carpet edge from fraying. For low-medium pile carpets. 1-3/8" wide, in 3' and 6' lengths. Fasteners provided. 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.