This automatic case actuated drum powder measure accurately and automatically dispense powder in your favorite cartridge. There are two infinitely adjustable drums included (one handgun and one rifle). These Quick Change drums will accurately and reliably drop charges from 1 to 80 grains of powder. The exclusive elastomer wiper prevents powder shearing. It works great with difficult metering extruded powders. Machined body with labyrinth groove mates to the precision molded nylon drums providing a leak free fit with the finest powders. The drum is actuated by a steel sector and pinion gear train. It features a quick-change hopper has on/off valve to quickly change powders; seek modern design, all gears springs and levers inside the die cast housing; and has the same swivel adapter as our famous Pro Auto-Disk powder measure.