... .Standard or Nonstandard:Standard 4.OEM Service:Available Durable Copper Flat Washers,Copper Washer Copper Flat WashersSpecifications1) Standard:DIN125,DIN127,ISO,ASME/ASTM,JIS ... China. We have advantaged technologh,and can product the different copper washer professionally ,OEM service is available .Please tell us the drawing ...