Lee Factory Crimp Dies - The Best Crimp In The Business

There is confusion on the Lee Factory Crimp Dies - Are there collets for crimping revolver rounds or carbide for crimping rifle rounds? How do the collet crimping dies work? Here is a video on the Lee Factory Crimp Dies of which there are different types...Note - the carbide rings do not wholesale resize the rounds - only removes bulges that would impede functioning....