The Lee Pro Auto-Disk Powder Measure features an elastomer wiper and teflon coated metal casting which makes it the smoothest operating measure. Will not cut powder and almost totally eliminates leakage. Large hopper with shut-off valve is attached with brass thumb nuts for the ultimate in disk changing convenience. Increased safety with positive pull-back lever. Includes swivel adapter and spring return lever with spring. Also includes four powder disks. The Pro Auto-Disk powder measure must be used with the powder through expanding die supplied with all Lee pistol dies.