.......The heart of the Gracey Power Neck Shaver is the patented cutter head which houses three adjustable cutters and a mandrel matching the inside diameter of the case neck to be shaved. The amount of material removed from the outside of the cartridge case neck and ultimately the neck wall, is controlled by adjusting the cutter in or out of the cutter head......
Man, I have enough trouble getting the two blades set right on my old Makita 1100 wood planer!