This simple door stopper holds your door open properly to prevent slamming doors and door knob impacts. It works well on parquet, laminate, cork, marble, tile or any other smooth surface. It keep your home door securely open with this door stopper. It can be used in many different ways, from keeping a door open to keeping it closed. This innovative door knob can used in restaurant, office building, school classroom, garage, warehouse, or manufacturing facility.