ROHN TB3 Thrust Bearing for ROHN 25G 45G 55G Towers FOR USE ON ROHN 25G, 45G, and 55G TOWERS SUPPORTS UP TO 2" OD MAST For use with ROHN 25G: Mounts to ROHN BAS25G Bearing & Accessory Shelf, BPL25G Bearing Plate, and 25AG4 Top Section For use with ROHN 45G: Mounts to ROHN BPL45G Bearing Plate and 45AG4 Top Section For use with ROHN 55G: Mounts to ROHN BPL55G Bearing Plate