"The UAP Doormaster 12"" Anodised Silver Letterplate is designed for secure, durable and draught-proof performance on uPVC, composite and wooden 40-80mm doors. With strong anodised aluminium flaps, a telescopic adjustable fit and a dual-flap design for smoother letter handling, it provides long-lasting protection and improved insulation. The patented 180° anti-snap flap mechanism, anti-scratch frame and simple self-aligning installation make it an ideal replacement letter box for any modern front door.Key Features• Internal & External Flaps: Dual-flap design enhances insulation, security and smooth letter delivery.• Durable Aluminium Flaps: Strong, corrosion-resistant anodised aluminium paired with an anti-scratch frame.• Patented 180° Anti-Snap Flaps: Engineered to open fully without snapping or weakening.• Adjustable 40-80mm Fit: Telescopic design suitable for uPVC, composite and wooden exterior doors.• Easy Installation: Single fixing screw on each side auto-aligns with the screw boss for fast, accurate fitting.• BS EN 13724 Tested: Built to withstand over 100,000 opening and closing cycles for long-term reliability.• Reliable Replacement: Trusted Doormaster design integrates seamlessly with most UK front doors.• 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."