Lee Primer Pocket Cleaners double ended design cleans both large and small primer pockets so that primers can be fully seated for better accuracy and safety. *Will not work on the 204 Ruger or 50 BMG brass. Size Cleans Large & Small Primer Pockets Type Primer Pocket Cleaner Finish Black Series Pocket Cleaner Weight 0.05 lbs Caliber all but 204 ruger50bmg Function Cleans Primer Pocket Includes Primer Cleaner Material Steel Quantity 1 Media Type Brass Shell Compatible With All Cases but 204 Ruger/50BMG