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 A 1/4" 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 with our Sinclair Priming Tool Shell Holders. Select the appropriate shell holders for your favorite cartridges. The Universal Caseholder works with the same #749-002-109 driver as our original caseholders, and it is available as a &ldquo Mfg: Sinclair International