The Rock Chucker Supreme press loading window is a spacious 4.25" to allow easy loading of today's longer cartridge designs. With the same easy operation, ambidextrous handle, outstanding strength and versatility, the Rock Chucker Supreme is ideal for the beginner and pro alike. The Rock Chucker Supreme single-stage press includes: Rock Chucker Supreme Press with ambidextrous handle, spent primer catcher, primer arm with large and small primer plugs and sleeves.