Factory replacement part for the RCBS Pro 2000 Reloading Press. Installs beneath the shellplate. Shell plates are usually rotated by grasping one or more of the cartridge cases in the shell plate and then using them to turn the plate to the next station. The star wheel allows for faster, easier indexing because the shell plate can be turned using one of the extensions on the star wheel. The cartridge cases then do not need to be handled once they have been inserted into the shell plate. Also fits Piggyback Presses (those that manually index).