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 ... , AS, GB and so on.material materials:carton steel,stainless steelsizeby clientssurface treatmentblack, hot dip galvanization, electro ... :packagingfactory viewTesting equipmentsWorkshop Welcome your visit! M16 M30 Metric carbon steel domed nuts