The Staywell 270n Slim Profile 4 Way Locking Cat Flap gives you control by allowing you to set the cat flap: In only, Out only, Fully locked , Fully unlocked. The flap has a solid transparent flap with magnetic seal for improved energy efficiency. See through finish with see through rigid flap. Suitable for fitting into sliding Wood & Single/Double Glazed Doors/Patio Doors. Overall Size: 292 x 292mm. Glass Cut Out Size: 260mm diameter. Max Pet Shoulder Width: 180mm. Suitable for cats/dogs up to 10kg in weight. Universal fitting for doors & windows. IMPORTANT. It is not possible to cut wholes in toughened glass or double glazed units except at the time of their manufacture. Please contact a reputable glazier for advice.