Strong and Durability: Heavy duty door stopper made of stainless steel electroplating process and durable rubber, metal doorstop very nice finish, waterproof and rust-proof, strong and durable. It is heavy duty product and sturdy enough for any heavy-duty door. Adhesion & Non-slip: Door stoppers for bottom of door do not slide because there is rubber on both the top and bottom of this mighty little wedge. Rubber provides a firm grip on floor & door without budging.The door will not move even with gusts of wind. Adjustable Design: Door wedge stopper tall 3 inches (75mm), spring loaded door stop can adjust height will fit any door gap from to 3. Most doorstops are too short and the door easily slides over it, but this adjustable door stopper tall enough works perfectly. Excellent Door Stop: Large door stopper suitable for any heavy commercial swinging door, metal door, double doors, safety door, self-closing hinged door and balcony doors with more space underneath, It is also suitable for glass door, carpet, parquet or tile and it works fantastic. Safe and Sturdiness:Door stoppers automatically adjusts to the gap, great for commercial, residential, garage, corporate, public places, school, hold opening every heavy door for you, makes it stay open and keeps the door from blowing shut in the wind.