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 A 1/2 pound of powder. Lee Pro Auto Disk is designed for use with Pro 1000 and Load-Master presses. Used with the Powder Thru Expanding Die or Rifle Charging Die. Includes swivel adapter and spring return Mfg: Lee Precision