Lee Auto-Prime & Ergo-Prime users with tools purchased earlier than 2016 will require this upgrade kit if you plan to use this folding primer tray with your tool. One tray is included in the package. The upgraded triangular trays have a built-in primer flipping feature allowing direct filling from today's large primer boxes. This kit includes XR small and large primer adapters and one folding primer tray, to cover all your priming needs.