M-D 0.13 in. H X 1.75 in. W X 36 in. L Satin Nickel Aluminum Flat Top Threshold Gray

This MD Building Products 1-3/4 in. x 36 in. Deluxe Satin Nickel Flat-Top Threshold seals gaps up to 1/8 in. high between the bottom of your door and the floor to help to seal out drafts.
Extruded aluminum smooth flat top saddle threshold; satin nickel finish Heavy-duty aluminum for long lasting durability
Seals gaps up to 1/8 inch high