Super 1050 Quick Change Kits allows you to leave your dies and powder charge set up and dedicated to a specific cartridge for faster, easier caliber changes.  Caliber changes require a caliber conversion kit (sold separately) in the caliber you want to add to your Dillon Super 1050. This set consists of one Super 1050 powder measure nr. 20421 and one Super 1050 Toolhead nr. 20420. Be aware that the ratchet does not interchange between the Super 1050 and the RL1050 due to differences in length. If you have an RL1050, order toolhead #19399.NOTE:Caliber conversion is not included.