Aluminum. To join 2 surfaces of different levels. Carpet-to-tile, carpet-to-hardwood, low pile to high pile carpet. Screw nails included. 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. No. 66001: Length: 3', Width: 7/8", Material: Aluminum, Finish: Polished, Smooth, Pkg Qty: 1, Package Type: Bag No. 78006: Length: 3', Width: 7/8", Material: Aluminum, Finish: Satin Silver, Fluted, Pkg Qty: 1, Package Type: Bag No. 79004: Length: 3', Width: 7/8", Material: Aluminum, Finish: Satin Brass, Fluted, Pkg Qty: 1, Package Type: Bag No. 66217: Length: 6', Width: 7/8", Material: Aluminum, Finish: Polished, Smooth, Pkg Qty: 1, Package Type: Bag No. 78089: Length: 6', Width: 7/8", Material: Aluminum, Finish: Satin Silver, Fluted, Pkg Qty: 1, Package Type: Bag No. 79087: Length: 6', Width: 7/8", Material: Aluminum, Finish: Satin Brass, Fluted, Pkg Qty: 1, Package Type: Bag No. 78071: Length: 3', Width: 1-3/8", Material: Aluminum, Finish: Satin Silver, Fluted, Pkg Qty: 1, Package Type: Bag No. 79079: Length: 3', Width: 1-3/8", Material: Aluminum, Finish: Satin Brass, fluted, Pkg Qty: 1, Package Type: Bag No. 43854: Length: 3', Width: 1-3/8", Material: Aluminum, Finish: Pewter, fluted, Pkg Qty: 1, Package Type: Bag No. 74187: Length: 3', Width: 1-3/8", Material: Aluminum, Finish: Almond, fluted, Pkg Qty: 1, Package Type: Bag No. 78154: Length: 6', Width: 1-3/8", Material: Aluminum, Finish: Satin Silver, fluted, Pkg Qty: 1, Package Type: Bag No. 79152: Length: 6', Width: 1-3/8", Material: Aluminum, Finish: Satin Brass, fluted, Pkg Qty: 1, Package Type: Bag No. 43856: Length: 6', Width: 1-3/8", Material: Aluminum, Finish: Pewter, fluted, Pkg Qty: 1, Package Type: Bag No. 74336: Length: 6', Width: 1-3/8", Material: Aluminum, Finish: Almond, fluted, Pkg Qty: 1, Package Type: Bag No. 79244: Length: 3', Width: 2", Material: Aluminum, Finish: Satin Brass, fluted, Pkg Qty: 1, Package Type: Bag No. 78212: Length: 3', Width: 2", Material: Aluminum, Finish: Satin Silver, fluted, Pkg Qty: 1, Package Type: Bag No. 43858: Length: 3', Width: 2", Material: Aluminum, Finish: Pewter, fluted, Pkg Qty: 1, Package Type: Bag No. 72066: Length: 3', Width: 2", Material: Aluminum, Finish: Satin Brass, smooth, Pkg Qty: 1, Package Type: Bag No. 79251: Length: 6', Width: 2", Material: Aluminum, Finish: Satin Brass, fluted, Pkg Qty: 1, Package Type: Bag No. 78220: Length: 6', Width: 2", Material: Aluminum, Finish: Satin Silver, fluted, Pkg Qty: 1, Package Type: Bag No. 43860: Length: 6', Width: 2", Material: Aluminum, Finish: Pewter, fluted, Pkg Qty: 1, Package Type: Bag No. 72249: Length: 6', Width: 2", Material: Aluminum, Finish: Satin Brass, smooth, Pkg Qty: 1, Package Type: Bag