The Big John Window Wedgie sliding door and window stopper works on almost all sliding doors and windows to prevent children from falling out of open doors or windows and to increase security. It is easily removable by adults to allow a window or door to be opened for ventilation. Can withstand over 90 lb. of shear force. Stops sliding doors and windows from opening too far .Helps prevent falls .Heavy duty suction cup.Adjustable and removable by adults.Added security.Made in the USA.