Lee folding primer trays are designed for use with the Pro 1000, Load-Master, Safety Prime, New Auto-Prime, Ergo Prime and Auto Bench Prime. Auto-Prime & Ergo-Prime users with tools purchased earlier than 2016, the XR/Ergo Update Kit (MidwayUSA #254-076) is required if you plan to use this folding primer tray with your tool. This folding tray replaces PT1004 on the Pro 1000, Load-Master and Safety Prime, and the trays (PT1564, PT1538, PT2964) and covers (PT1534, PT1470) from the Auto-Prime and Ergo-Prime tool.