Designed for the 600 Jr., 700 Versamc, and Sizemaster, the MEC Primer Cup is an inexpensive but handy accessory to have on hand. Sometimes parts become damaged or break completely; instead of stopping a reloading session, having extra parts on hand allows you to continue without interruption. MEC puts just as much pride in the manufacturing of the primer cup as it does its higher-dollar items. This cup enhances the reloading process, is made from quality materials, and has excellent workmanship. Reloaders feel confident with this and all MEC purchases, because the products have been proven to perform.