M-D 0.63 in. H X 3.5 in. W X 36 in. L Satin Nickel Aluminum Thermal Break Threshold Gray

This MD Building Products 3 ft. x 4-9/16 in. x 1-3/8 in. Satin Nickel Aluminum Adjustable Thermal Break Threshold helps seal gaps under your door between 1-3/8 in. - 1-5/8 in. to help make your home more energy efficient for your convenience.
Premium adjustable threshold with satin nickel finish
No rot no warp composite design; easy to install and adjust
Seals gaps from 1-3/8 inches to 1-5/8 inches high