The Sinclair Driver and Caseholder system is designed to hold and turn your case while you are neck turning,cleaning case necks or case mouth deburring. The Caseholders and Driver are machined from stainless steel, and the driver has a one fourth hex shaft for use in power screwdrivers or low-speed drill motors. The driver is universal to the Sinclair system and will work with all the Caseholders. Our universal Caseholder enables you to use this system for any cartridge case which has a Lee Auto Prime sheelholder available for it. The Universal Caseholder works with the same #05-2500 drivers as our original caseholders, and it is available as a kit with the Driver and Universal caseholder or Mfg: Sinclair International