... .Coated length:50mm, 60mm, 70mm, 80mm available3.Diamond grit:#120, #150, #180, #300 available4.Coating: nickel, titanium, available Electroplated ... as carbide,stainless steel,glass,ceramics carbon...they are electroplated with selective synthetic diamonds on steel base.low ... cost,durability and versatile performance make electroplated diamond files a must in precision working. Jiangyin ...