Product Overview Specifications: Color: White Material: Plastic Product Dimensions: 20 x 19 cm Features: Sturdy1. Updated wiper rod: Provide a fixing groove with a buckle for the wiper rod to secure the wiper rod securely. Even if the brush strip comes off, you can easily reposition it into the mounting groove. This greatly helps the brush strips reduce noise and provide as much protection as possible from raindrops, wind or pests such as mosquitoes. 2. Safe and well thought out: pets can see out of the door through the transparent flap. The exterior rain seal is waterproof. Brush strips eliminate noise when the door closes. 4-way smart door control gives cats more freedom. The inner edges of the frame are polished to prevent harm to cats. 3.4-way switch mode: The flip door can be customized into four modes: exit, entry, in and out, and full lock. Give the cat as much freedom as possible. 4. EXCELLENT QUALITY: Made of weatherproof ABS material with smooth and durable surface. Packing list: Installation method: Required tools: electric drill, iron or electric saw, tape measure; Step 1: First record the size of the door cover on a piece of paper (there may be a few millimeters error) Step 2: On the door Draw the pattern and trace it with a pencilStep 3: Use a drill to drill a hole in each of the four corners of the sliding door. If you have an electric saw, start digging directly. Step 4: If it is a glass door, use a pry bar to gently Open the scraper and fix it with glass glue Step 5: Clean the hole, now make a layer of scalp to wrap the hole and form a beautiful pattern Step 6: Install the cat flap, there are accessory screws, tighten it with a screwdriver Step 7: Screw The door is also equipped with a screw cover, press it and OK is done. Note: 1. Due to manual measurement, please allow an error of 0-2 cm. Thank you for your understanding. 2. Actual color may vary slightly from image due to light and brightness differences on monitors.