Designed for both cats and small dogs this Pet Tek Glass Fitting Pet Door is suitable for double glazing and most double glazed sliding doors. This pet door not only looks great but will also give you the peace of mind that your pet is secure. Renowned for their trouble free performance this product will endure years of regular use.KEY FEATURES: Supplied with weather seal to reduce draughts and enable a smooth quiet action Manufactured from high impact polycarbonate UV stabilised No external screws Four way locking with additional security pin - choose from allowing your pet in only out only to move in both directions or keep the door completely closed Recommended pet size: Medium cats and small dogs Self draining condensation outlet No external screw for security No cavity feature prevents dirt getting trapped in glass windows All Stainless Steel screwsDimensions:  Overall size: 30.4cm diameter Flap size: 19.5mm x 18.5cm Application: Glass from 3mm to 28mm Cut out size: 26.7cm diameter Projects 11mm from the glass Click here for Instructions.