Window Restrictors: The package comes with 2 packs of window safety locks. Two window locks include a left window and a right window. Durable Material: The window safety lock is made of high-quality 304 stainless steel. With strong corrosion resistance, high toughness, rust prevention, and long service life, the window can be firmly fixed for you. Easy to Install: Our window restrictor can be installed with only a screwdriver. It is convenient for you to quickly attach the child safety stopper to the window. Reasonable Design: Our window lock can be completely released to facilitate indoor ventilation. When you have finished ventilating the house, you can reactivate the window lock at the limit position. Wide Application: You can use this window lock in almost any place, such as home, kindergarten, school, hospital, office, etc., to prevent accidents when opening the window.