DIN1587 Hex Domed Cap Nuts Size: M3-M30 Grade: 4-12 Material: carbon steel, alloy steel, stainless steel, copper,etc. DIN1587 Hex Domed Cap Nuts Size: M3-M30Grade: 4-12Material: carbon steel, alloy steel, stainless steel, copper,etc.Finish: Plain, Black, Hot-dip Galvanizing, Zinc Clear, Zinc Yellow, Zinc Black, Copper Yellow, Dacromet, etc. Hex Domed Cap Nuts