The Lee Pro Auto-Disk powder measure is perfect for the high volume reloader utilizing a progressive reloading press. The innovative design will not cut powder and almost totally eliminates leakage, the large hopper with shut-off valve is attached with brass thumb nuts for the ultimate in disk changing convenience. The positive pull-back lever increases safety. Comes with four disks, swivel adapter and spring return lever with spring. Designed to be mounted on the Lee Pro-1000 and Loadmaster presses with Lee powder-through expander dies.