National 4 inches Satin Brass Door Hinge is great for use on interior residential doors. It's a great brand for securing your homes, offices, other spaces. Absolutely durable, the products from National provide excellent quality. They have always tried to produce good quality, safety-identification products to help make the world safer place to be in. They try to deliver the highest quality products in the fastest way possible. Providing a safe environment by making the best quality products is their only motto.