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Diamond plate, also known as checker plate, tread plate and Durbar floor plate, is a type of lightweight metal stock with a regular pattern of raised diamonds or lines on one side, with the reverse side being featureless. Diamond plate is usually steel, stainless steel or aluminum. Steel types are normally made by hot rolling, although modern manufacturers also make a raised and pressed diamond design.
Used on stairs and catwalks in industrial settings, the added texture reduces the risk of slipping. For this reason diamond plate is frequently used on the interior of ambulances and on the footplates of firetrucks. Diamond plate can also be used decoratively, particularly highly polished aluminum variants.
Tata marketed the plate as Durbar Plate.
"Diamond plate" can also refer to similar anti-slip textures.