Features:Made of great quality ABS material, transparent door and white door frame.External acrylic material surface is smooth, strong, sturdy and durable.Transparent flip door, convenient to view the situation outside the house.Classic square appearance design, simple and beautiful.Easy to install, L is suitable for pet under 6kg, waist circumference under 60cm. XL is suitable for pet under 12.5kg, waist circumference under 75cm.Specification:Condition: Brand NewMaterial: ABS + AcrylicColor: as picture shownSize: L, XL (optional)L: 25.5x24x2.4cm/10x9.4x0.9inch (outer size), 19x18cm/7.5x7.1inchXL: 28x25x5.5cm/11x9.8x2.2inch (outer size), 22x20cm/8.7x7.9inchInstall Steps: 1: Use a piece of paper to draw the hole size on the door.2: Use a drill to drill a hole at the four corners of the door, and then use a electric saw to cut the hole directly.3: The appropriate cutting range is about 3~6mm, such as small cat door 1~3mm.4: Fix the cat door with double-sided adhesive tape, (with accessories screw), and screw it with a screwdriver.5: Equipped with screw cover. Press it and finished.If it is a glass door, using the glass tool, gently cut, using the glass glue fixed.Package List:1 x Pet Door1 x Manual4 x Double-sided Adhesive Tape 8 x Screw Cap12 x Screws.