PACKAGE：18-Pack 1/4" Radius 3-1/2" x 3-1/2" Door Hinge with 108 Mounting Screws for installation and easy to use .For optimal performance, we recommend using 3 hinges per door Premium Material:The interior door hinges are made of steel with a black coating on the surface, which is waterproof and rust-proof, sturdy and durable, suitable for long-term use Low Noise: Due to the addition of damping oil, the door hinge operates with minimal noise and smooth opening and closing, making it ideal for all types of residential doors Easy installation: Comes with screws and adjustment tools needed for installation, making installation quick and easy Wide Applications: Black matte door hinges can rotate up to 270 degrees and are suitable for use in residences, hotels, offices, hospitals, stores, factories, classrooms, libraries, gyms, ship cabins, kitchens, and other locations