M-D Building Products 43822 Adjustable/Thermal Break Threshold, 36" L x 4-9/16" W x 1-5/8" H, Aluminum Fits doors up to 36-Inch wide All-season protection against drafts, moisture, dust and insects Easy to install and adjust Seals up to from 1-3/8-Inch to 1-5/8-Inch gap between bottom of door and threshold No rot/ no wrap composite design and thermal break design prevents frost build up on interior surface