Option: B1, B2, B3 (5/16” tube) (part # 028271-053)
Option: B4, B5 (3/8” tube) (part # 028271-057)
Note: To determine which press you have, Co-Ax Press B1, B2, B3 will have either Bonanza stamped on the frame casting, or under the vertical Forster there will be a patent number. Co-Ax Press B4, B5 will have MADE IN THE USA stamped under the vertical Forster.