The 5-5/8 in. x 3 ft. Sill Threshold can be used with pre-hung doors to replace old thresholds. The threshold is made from heavy-gauge aluminum for strength and durability. It features a low rug design for use with heights up to 3/4 in. and adds a handsome silver appearance to your entry door. The threshold can help prevent the cold from entering your home with its Thermo-Barrier.