The Rock Chucker Supreme combines easy operation, ambidextrous handle, outstanding strength, and versatility to earn that coveted spot on your reloading bench. Featuring a spacious 4.25" loading window that is perfectly suited for loading longer magnum and a central pivot design that provides outstanding leverage to size the toughest cases. The Rock Chucker Supreme also has large mounting points, a long handle to ensure you can size your cases with ease and without fear of pulling your press off your bench. Accessory Base Plate not included. Accepts Standard 7/8"-14 thread dies with bushing, and 1-1/4"-12 without bushing 4.25" Operating Window Mfg: Rcbs