This door is a manual 4-way locking door that can be upgraded to a magnetic cat door by simply inserting the PC61-C upgrade cartridge. Key Features: Designed for single pane, double glazing and wood installations up to 50mm thick Can also be installed in walls up to 300mm thick using as many wall tunnels as required (each wall tunnel adds 50mm) Can be installed in most ranch sliders (requires 17mm clearance) Fits cut out hole 267mm in glass Large flap 170mm (w) x 175mm (h) 4-way locking system (Upgradable to magnetic or selective entry) Virtually unbreakable flap made of high impact Bayer Polycarbonate Self-lining frame to prevent dirt entrapment Strong NdFeb magnet provides self-locating flap and holds flap closed against strong winds Silicone coated brush seal to prevent draughts 3 year warranty against faulty manufacture Available in white Installation Instructions: Glass cut out hole size: round hole 267mm diameter Wood cut out hole size: 185mm (w) x 240mm (h) Overall size: 295mm (w) x 285mm (h) Flap size: 170mm (w) x 175mm (h)