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.