Quick Change Drum Set can be used in conjunction with the Deluxe Perfect Powder Measure, 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 adjustment 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. Features four precision molded nylon drums:(2) small drums for charging 25 ACP to 223 Remington (2) large drums for charging the 223 Remington to Large Magnums. Also include an insert to allow reduced capacity charging similar to smaller drum.