... -resistant 3. Accord with GB6003.1-1997 standard and ISO3310-1:1990 R20/3,R20,R40/3 series 1. Featureseasy to use, attractive and ... Steel, H80 BrassStainless SteelStainless SteelProduction TechnologyWeavingPunchingElectrochemical machiningProduction StandardGB6003.1-1997 standard and ISO3310-1:1990 R20/3,R20,R40/3 seriesGB6003.2-1997 ...