Features:-Raises the powder hopper, permitting two disks to be stacked in powder measure-Doubles the capacity-Makes very fine adjustments possible-Most powders can be adjusted up or down .1 grain with different combinations of disksIncludes:-Disk A = .30 to .43 cc-Disk B = .46 to .66 cc-Disk C = .71 to 1.02 cc-Disk D = 1.09 to 1.57 cc-Complete listing of combinations-Screws & risers