cad plating versus zinc plating

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Yes Bill you are right you can get dofferent colors, most bolts and screws are zinc plated and have standard colors for different applications. Blue for metric green for a ground on electrical connections etc. There is no noticable difference in zinc and cad when done. Does anybody sell a home setup to zinc plate. I know Eastwood does but it looks to small to do any thing but nuts and bolts.