The UK's most popular style of letter plate. Now available in grade 316 stainless steel which offers exceptional anti-corrosion value and provides excellent protection against the elements. Suitable for the external coastal environment and comes with an additional gasket to prevent water ingress. Plated stainless steel spring, concealed cap, and inner bolts. The sprung inward opening flap automatically closes once the package has passed through the aperture. The well-defined edges and plain design make for easy cleaning. Suitable for residential and commercial use.