For use with Wheels Mfg Bottom Bracket Press (PRESS-7, PRESS-7-PRO or PRESS-9-PRO) 29mm open bore adapter is used to press 29mm x 42mm (DUB) sealed bearings Machined with one step at 29mm OD, which fits into the center of the sealed bearing Bearing Press Red Dub Bearings 29SRAM-OBUPC/EAN/GTIN: 811079025364