Spring Design: Built-in telescopic foot operated spring allows you to open/close the door, suitable for most types of door. Foot Operated: It offers an innovative step mechanism for convenient and hands-free operation. Durability: Stainless steel material, anti-corrosion and anti-rust. Screw Installation: Install on the door, this installation method is more stable, firmer and will not fall off easily. Comes with mounting screws to make your installation more convenient.