... .01mm 3.Material:Kovar(4J42,4J29) 4.Finish:Gold/Ni/Silver plating Fiber Optic Precision Metal Component-shaft with Gold/Ni ... ,Invar,WCu,Stainless steel, Aluminium, White/Black Delrin etcFinishGold/Ni/Silver plating, Bkackening, Anodization, Passivate, Sand Blasting, Polishing.Terms of trade:FOB ... together. Fiber Optic Precision Metal Component-shaft with Gold/Ni Plating