Fire Proof Letter Box. RoydeAnd Tucker 60 Minute Fire Rated 42-47mm Doors
42–47mm, 47–52mm, 52–57mm. Door Thickness 42mm to 47mm. The Royde & Tucker letterplate 60 Minute Fire Rated Letterplate Assembly 42-47mm Doors. It can be installed as a refit item or into new doorsets.