PRODUCT DESCRIPTION The M-D Adjustable Aluminum & Hardwood Threshold features an adjustable riser to seal uneven gaps underneath your door. This product protects the home against drafts, moisture, dust and insects. The threshold can be used with a new door or to replace an existing threshold. All of the hardware needed for installation is included. Before installation, the threshold can be cut to a desired length using a hacksaw. To best seal your doorway, this product can be used with a door sweep or an under door seal. FROM THE MANUFACTURER Deluxe model adjustable height threshold. Oak riser adjusts to seal gaps under your door from 1-1/8-Inch to 1-3/8-Inch Heavy duty aluminum and oak design 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 provide the best weather-tight seal. Make your home more comfortable and save energy at the same time.