Complete your door with the UAP Framemaster 12" Polished Silver Aluminium Letterbox, designed for smooth operation, reliable performance and a bright modern finish. Suitable for wooden, composite and uPVC doors 20 to 40mm thick, it features internal and external flaps that improve insulation, enhance weather protection and make everyday posting easier. This polished silver letterbox provides a long lasting upgrade for both new installations and replacements.Key Features• Quality Tested to BS EN 13724: Built to withstand over 100,000 opening/closing cycles for dependable performance.• Industry Standard Replacement: Trusted Doormaster design ensures smooth integration with a wide range of door styles.• Distance Between Screw Holes: 272 mm• Letterplate Length: 300 mm• Letterplate Height: 74 mm• Letterplate Width: 40-80 mm• Cavity Hole Size: 257 mm × 42 mm.