Usage Tips:Strong and Durability: Heavy duty door stopper made of stainless steel electroplating process and rubber, metal doorstop very nice , 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 inch to 3inch. 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 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 Material:Stainless steel Package Contents: 1 * 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.