1. Adjustable height, suitable for various doors. The door stop is 3 inches (75 mm) high, and the spring design can be adjusted to fit any door with a ground clearance between 0.5 and 3 inches. A clearance less than 0.4 inches is not applicable2. Anti-slip design. The bottom and top design are equipped with rubber fasteners, and the heavy-duty door stop will not slide. The rubber can firmly grip the floor and door without moving3. Universal floor compatibility. The door stop firmly grips all surfaces, including cement floors, carpets, wooden floors, tiles4. Strong and durable. The heavy-duty door stop is made of stainless steel and durable rubber, which is waterproof and rust-proof. It is strong enough to withstand any heavy-duty door