M-D Building Products 49008 M-D Adjustable Thermal Break Door Threshold, 4-9/16 1-3/8-1-5/8 in H, 36" L x 4-9/16" W x 1-5/8" H, Satin Nickel All season protection against drafts, moisture, dust and insects No rot no warp composite design; easy to install and adjust Thermal break design prevents frost build-up on interior surfaces; Seals gaps from 1-3/8 inches to 1-5/8 inches high 4-9/16-inches wide by 1-5/8-inches high by 36 inches long