domed nut: 1size range: M16,M30 2grade:4,6,8,10 3standard:DIN,ANSI,JIS,AS,BS,UNI,ISO,GB 4certificata:SGS M4-M20 Metric steel long cap nut product namecap nutsproducer' s markSDLstandardASTM, BS, UIC, JIS, GOST, DIN, AS, GB and so on.material materials:carton steel,stainless steelsizeby clientssurface treatmentblack, hot dip galvanization, electro galvanization, Dacroment.we also can produce as ...