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Product Description M-D Thermal Break Threshold, Adjustable, 4-9/16 in Width, 36 in Length, 1-3/8 - 1-5/8 in Height, Fasteners: Set Screw, Aluminum. Aluminum adjustable Thermal Break threshold assures years of protection from the elements. Installing a threshold will help to seal out drafts from the bottom of your door. A door sweep is recommended to be used with this threshold to create a weather tight seal. Thermal break design prevents frost build up. Adjust to seal various gaps. From the Manufacturer Aluminum adjustable Thermal Break threshold assures years of protection from the elements. Installing a threshold will help to seal out drafts from the bottom of your door. A door sweep is recommended to be used with this threshold to create a weather tight seal. Thermal break design prevents frost build up. Adjust to seal various gaps.