High Quality - Made of 304 stainless steel and rubber. Stainless steel ensures that the handle will not rust over time. 5 ounces of solid rubber gives you the confidence to hold heavy doors. This door stopper can keep the door gap between 0.1-1.8 inches. Suitable for all surfaces - The serrated design top can make the door fall to the right edge, which helps the non-slip designed base and floor to create high friction, making the door stronger. (Note: Please make sure the door stopper and the surface are dry and clean before use) Wedge-shaped door stopper: The door stopper is wedge-shaped and suitable for door stops. The slope of the stopper is adjusted to increase the friction between the door and the stopper bar, making it non-slip. In addition, they can even hold the heaviest doors. No marks will be left on the door and floor - Unlike traditional door stops, it requires you to use screws to fix it to the door and floor. This door stopper is very simple to use, just insert the door stopper into the gap between the door and the surface.