... surface with flatness not exceeding 3mmApplicable Scope: Motor part, Mechanical part, Machine tool, Hardware product, Valve, Pump valve, Electro-mechanical equipment ... the traces of pre-edited letters, numbers, codes and graphs, meanwhile, to work pieces at a high frequency under the application of compressed air, to form the ... , Copper, Stainless Steel or PVC material.(6) To mark Dividing Rulers ...