"Complete your door with the UAP Doormaster 12"" Silver Draught Proof Letterbox, designed for secure, smooth and reliable everyday use. Suitable for uPVC, composite and wooden doors 20 to 40mm thick, it features internal and external flaps that help reduce draughts and support easy letter handling.The aluminium flaps open fully to 180 degrees and are engineered to resist snapping, while the anti scratch frame helps maintain a clean appearance. The telescopic design ensures a precise fit across a range of door thicknesses, and installation is quick with the single screw fixing system. Tested to BS EN 13724, the Doormaster range includes long lasting components that withstand more than 100,000 opening and closing cycles, providing a dependable replacement for modern homes.• Distance Between Screw Holes: 272 mm• Letterplate Length: 300 mm• Letterplate Height: 74 mm• Cavity Hole Size: 257 mm × 42 mm."