This letterbox flap is rectangular in brushed stainless steel. You can fit it to a PVC, wooden or aluminium door. The flap opens inwards and closes automatically when mail arrives. With outer dimensions of 300 x 75mm and flap opening of 230 x 55mm. Do you want to receive your mail properly at home? That starts with a good letterbox or letterbox flap. The dimensions of this letterbox flap comply with the guidelines of: + Bpost Belgium (230 x 30mm). + Postal Service France (230 x 30mm). + Postal Service Germany (230 x 30mm). + Postal Service U.K. (230 x 33mm).