Frost King 1-14x 36 Aluminum Door Bottom is a simple yet very useful product. This door bottom is used to prevents the entrance of dust, water, and insects into your home through the gap present between the door and floor. It features pre-drilled holes, which allows you to adjust the height of the door bottom. It also makes the installation of this door bottom effortless. The rubber is made of high-quality materials, which ensures long-lasting utility. The rubber will not cause any damage to your door. (1)Easy to install. (2) Comes with pre-drilled holes. (3) Rubber do not cause damage to your floor. (4) Ideal for both wood and metal doors