Widely Used: This Pet door is suitable for windows, glass doors, brick walls, PVC, PVC and metal doors.EASY TO INSTALL: The package contains screws and nuts. No need to assemble products. Ready to use in a short time.LOCKING MODES: open, closed, entry only or exit only. This allows your cat to enter and exit at will without losing control of access.SILK HAIR BRISTLE: The main components are made of durable ABS material. Designed to be weatherproof and windless. Minimize heat exchange inside and outside the house while minimizing fluttering noise.TWO COLORS THREE SIZES: There are two colors and three sizes to choose from, according to your needs to choose the most suitable product.The package includes:Frame x1Cover x1A set of accessoriesEnglish Manual x1Safety doors can be installed in glass doors, wooden doors, iron doors, security doors and glass windows. It also prevents the escape of heating and cold air. Cats can pass through the front and back of the door and can be adjusted at will.Specification :Material: ABS (acrylonitrile butadiene styrene), acrylicS: Inner 16 x 15.7 cm Frame 20 x 19.2 x 1.8 cm (Suitable for thin materials such as glass doors)M: interior 16 x 15.7 cm Frame 20 x 19.2 x 5.5 cmL: interior 19 x 18 cm Frame 25 x 23.5 5.5 cm