This is not a set, it is just one drum, large.
Quick Change Drum can be used in conjunction with the Deluxe Perfect Powder Measure, the Auto Drum Powder Measure and the now discontinued Classic Powder Measure.
All drums are infinitely adjustable within range. No tools are required for adjustment. A graduated adjsutment key iincluded with each drum. Each turn of the adjusting screw is .1cc or about 1 grain of powder. Each key is marked with .01cc graduations allowing easy 1/10 grain powder adjustments.
Quickly set your charge, and mark it and the powder type on the flat of the drum set for easy reference for future reloading.