The latest evolution in door furniture is now supplied on Composite doors, as standard. With the external furniture now manufactured from 304-grade stainless steel, all hardware carries a 10-year anti-corrosion guarantee, and because this is the same grade of material used for making sinks, it's a guarantee that you won't expect to use!
The letter plate opens to 180 degrees and even the return spring is stainless steel which was cycle tested to 100,000 operations. The external flap houses a peripheral seal that also forms a full thermal and acoustic barrier.