The NAAMS Series of wear plate fully meets the North American Automotive Standard. They are 20mm thick and available in plain steel, steel with graphite plugs and bronze with graphite plugs. The bronze and steel with graphite plugs are self-lubricating products and do not require lubrication during production. All NAAMS wear plates are supplied with mounting holes to accommodate M12 S.H.C.S. For ease of identification, all products are marked with the part number.