Tread plate, also known as checker plate, wrestling steps and diamond plate, is a type of metal stock with a regular pattern or lines on one side for slip resistance. Diamond plate is usually steel, stainless steel or aluminium. Steel types are normally made by hot rolling, although modern manufacturers also make a raised and pressed diamond design. The most common alloy used for aluminium tread plate is 6061, although 5086-H34 and 3003-H231 are also used.