From The Anvil Polished Marine SS (316) Traditional Letterbox

For composite and upvc doors we would recommend using our door letterbox which is supplied as a full kit and contains a tunnel and brushes to reduce drafts and insulate the door. The sleeve inside the letterbox also protects the door from moisture and masks the aperture cutting. Features: Designed to match our other polished marine SS front door furniture to create a feature entrance door Maximum door thickness: 72mm.Minimum door thickness: 42mm Supplied with matching SS bolt through fixings Specifications: Dimensions: H:31.5 x W:9.5 x D:1.0 cm Weight: 1.9 kg Colour: Blue Guarantee:5 years Material: Stainless Steel Model Number: 49599