Our company produces all kinds of copper washers ,widely used,good in quality and competive in ... you Standard: GB,DIN,ISO,JIS,BS,ANSI Material : copper yellow metal Types : plain washer O.D:3MM-2000MMDescription1) ... and the like.Besides, our company has been approved of API certificate and ISO9001:2000, therefore, our production is ... according to specific drawings and meet your demands. copper washer