To join 2 surfaces of different levels

Carpet-to-tile, carpet-to-hardwood, low pile to high pile carpet

Screw nails included

Aluminum material with multiple finish options

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