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Product Description 3-1/2 inch x 7/8 inch x 36", up to 1-5/16", premium adjustable threshold, adjustment to seal uneven gaps between bottom of door & floor. This product adds a great value. Product is highly durable and very easy to use. This product is manufactured in china. From the Manufacturer Frost King Premium Adjustable Aluminum Threshold is a separate central section that can be adjusted up or down to provide the best possible weather-seal for your door clearance. Manufacturer Contact Information 1-800-526-5265