Elastomer wiper and Teflon coated metal casting make this 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 and all four disks. Many prefer the Pro Auto-Disk for mass production reloading. The hopper holds 1/2 lb of powder. Lee Pro Auto Disk is designed for use with any of our reloading presses. Used with the powder thru expanding die or charging die. Includes swivel adapter and spring return lever with spring.