... and black, engraving fonts 3,ROHS products Product nameMetal Ear phone Materials Available1. Stainless Steel: SS201, SS303, SS304, SS316, SS416, SS4202 ... , drilling, grinding, broaching, welding and assemblyQC (inspection everywhere ):Technicians self-check in productionSize customizedTolerance±0.01mmoffset distance±0.02mmPackageAs per customized ...