Strong and Durability: Heavy duty door stopper made of stainless steel electroplating process and rubber, metal doorstop very nice finish, waterproof and rust-proof, strong and . 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 not move even with gusts of wind. Adjustable Design: Door wedge stopper , spring loaded door stop can adjust height fit any door space from ½inch to 3inch. Most doorstops are too short and the door easily slides over it, but this adjustable door stopper tall enough works ly. 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 space, great for commercial, residential, garage, corporate, public places, school, hold opening every heavy door , makes it stay open and keeps the door from blowing shut in the wind. Colour:black+silver Material:Stainless steel Size:13CM Package Contents: 4 x Door Stopper Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.