Tread plate, also known as checker plate and diamond plate, is a type of metal stock with a regular pattern or lines on one side for slip resistance. The most common alloy used for aluminum tread plate is 6061, although 5086-H34 and 3003-H231 are also used. 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. "Diamond plate" can also refer to similar anti-slip textures.