One-touch semi-automatic door stop - 4 inch door stopper with a height-adjustable rubber by hashi (Chrome) INNOVATIVE DESIGN - In the state that door stopper is fixed on the floor, You just step it. Then it ascends. HEIGHT ADJUSTMENT - No tools needed, up to 1/3 inch up and down RUGGEDNESS - Doorstopper bottom portion has non-slip three dimensional curved structure, made out of high-quality material and, can be used on all floor surfaces EASY INSTALL - Doorstopper can be replaced in the previously installed hole or easily installed in enclosed sheet when newly installed SATISFACTION GUARANTEED - 100% Money Back Guarantee & LIFETIME Replacement Warranty ensures customer satisfaction