M-D 4-9/16" x 1-3/8" x 36" Satin Nickel Adjustable Aluminum Thermal Break Threshold a versatile solution for sealing uneven gaps beneath your door with its adjustable riser. Designed with a thermal break feature, this threshold is for homes in extreme temperature climates, as it creates an insulated barrier that prevents outdoor temperatures from transferring inside. This helps reduce heat loss and frost buildup on the threshold, while also protecting your home from drafts, moisture, dust, and insects. Suitable for both new door installations and s, it comes with all necessary hardware for easy installation. The threshold can be trimmed to your desired length using a hacksaw, and for enhanced sealing, it can be paired with a door sweep or under door seal. Model Number: 49008