Description: Quality Material: This pet door is made of premium pp material with smooth surface, sturdy for long time useDouble Entry Design: This cat door allows your cats and dogs to freely enter and exit, providing convenience for your pets' activitiesWith Transparent Board: This cat dog flap door adopts transparent board design, which is convenient to view the situation of the house indoor and outsideEasy To Install: This dog door is easy to install, simple and elegantWide Applications: This charming cats door is suitable for interior doors, exterior doors, walls, window and cupboards, etc Specification: Installation Instructions:Draw the size of the door cover on a piece of paper (there may be a few millimeters error).After preparing the drawing paper on the door properly mark it with a pencil.Drill holes at each corner of the marked area then start cutting out if you have an electric saw.If it's a glass door use a glass cutter tool gently cut open then fix it with glass glue.After making hole cover around it with wood for aesthetics.Install cat door using provided screws tighten them up using screwdriverScrew covers are also provided press them on after tightening screws Size Chart: 19cmx1.8cmx19.7cm/7.48inchx0.71inchx7.76inch Package Includes: 1 Pet Flap Door Note: Please allow slightly errors 1-2cm differences due to manual measurement.