... , Copper, Nylon, Plastic, etc.Product surface treatment: Zinc Clear, Zinc Yellow, Zinc Black, Tin-plating, Nickel-plating, Dacromet, Mechanical Galvanizing, Hot ... -dip Galvanizing, Dye Blackness, Copper Yellow, etc.Product intensity level: CL4.8,6.8,8.8 ... J429 Gr. 2,5,8we could supply all kinds of non-standard bolts acc.to the customer's drawing or samples.