Symmetric Design: This screen stopper and window stopper has a symmetrical design that allows you to use the screen without worrying about the direction of the screen. This is a screen lock device that prevents your cat from opening the screen. Prevent toddlers from falling out, prevent cats, dogs, baby from entering the window. Can be used for various purposes, including security and window stoppers, and doors other than screen doors Please measure before using: Open at least 0.2 inches (5 mm) from the window. When removing the hook, the distance of at least 0.2 inches (5 mm). If the distance is narrow, the screen stopper will snag and the auxiliary lock will not close the window (Easy Installation and Installation is Only 3 Steps) 1. Clean the dirt, 2. Determine the gap position of 0.2 inch (5 mm) and 3. Double-sided tape is attached. Uses "3M" VHB series double sided adhesive tape. In addition, its unique treatment is resistant to sunlight and heat, and will not leave a sticky residue after removal. Easy to install with just one touch! Just peel the tape on the back of the screen door lock and stick it to the window stopper, and your cat will give up escape (Comes with Meow Seal for Use) The screen door stopper can be used to prevent cats and dogs from escaping and safety for small children. Sliding door lock: Symmetric cat design is one of the highlights. Also comes with a cute cat sticker that can be attached to a screen door lock! Note: There may be scratches during the manufacturing process, but this does not affect the use. Please be aware of this before purchasing