Built-in foot operated telescopic spring makes it available for you to open/close door to save you from the disturbance of door squeak. The pedal is made of soft rubber to stop door once the pedal is in touch with floor,the soft rubber can protect your valuable carpet, floor and tile.This heavy duty and semi-automatic door stop is made from high quality stainless steel. It offers an innovative step-on mechanism for a convenient and hands-free operation. It features a spring loaded plunger.It is also builtwith high-quality non-slip rubber foot for an optimum grip on most surface.Step on, step off door stop - Didn't like other type door stops difficult to release the stop, have to bend over and lift up the stop. With this one, there is no bending overstep on the piston to set it in place, step again on the lever to release and it pops up. You just have to be careful to place it correctly on the door, making sure it doesn't hit the jamb when closing the door and placing it at the correct height for the rubber tip to hit the floor with enough pressure.Convenient and sturdy - Without a doubt these spring-loaded step-on door stops are the most convenient door stops. Strong and holds very well, it is easy to push down and release, even with bare feet.It suitable for all kind gaps of door.Fabulous door stopper - works great, solid build, easy install comes with mounting screws. If you needed something to hold out garage door open while carrying groceries or other stuff into the house. This semi-automatic door stopper would be good choice. Rubber foot can protect your valuable carpet, floor and tile. You don't worry about that floor was scratched. Note: It may be not work well on Slippery wood floor.