DIN7980 SIZE: all size Material:carbon steel steel ,SS Standard :DIN,JIS, ISO ,BS,ANSI Detailed Product DescriptionDIN7980 Material:spring steel ,SS Standard :DIN,JIS, ISO ,BS,ANSIDIN7980Material:spring steel ,SSStandard :DIN,JIS, ISO ,BS,ANSI Surface Finish:Various of finish is available DIN7980 Spring Washer