#protoUnmoderated tagAll postsExplore CommunitiesTrending CommunitiesNewcomers' CommunitySteemit FeedbackSteemitCryptoAcademyআমার বাংলা ব্লগKorea • 한국 • KR • KOSteem AllianceAVLE 일상Tron Fan ClubSteem For LifestyleBeauty of CreativityComunidad LatinaSTEEM CN/中文#protoTrendingHotNewPayoutsMutedddjfoid100 (32)in #proto • 2 months agoWhat Is a Ra 0.4 Surface Finish?A Ra 0.4 surface finish is an ultra-smooth, precision-machined surface roughness level used when parts need low…