I have one of the Enco/Grizzly/Shop Fox mills that has the R8 collet taper. Are all R8 collets threaded the same? I see some on ebay with standard threads to hold the collet in, but the mill being from China, maybe im dealing with a metric thread or is there a standard for this sort of thing. Also, im trying to fin the collets that have the allen bolt that holds the bit in. I understand that this type is better? Is there a certain name for that type of collet to make searching easier?

Thanks all!