All Aluminium letterboxes manufactured by Discount Hardware Products include the versatile Brunswick Design.This letterbox, including the traditional round top Royal Park design include a lock and key and are available powdercoated in a range of traditional colours. They are easily installed on commercial properties as they are in timber and steel picket fences, wire and colorbond fences.A longer letterbox is also available to fit into a brick pillar in both the Brunswick and the Royal Park design.