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Park Tool Steel Bottom Bracket Tool BBT 179 low speed compression Material Aluminum Color Black Model MFPN=16820 Material Aluminum Color Black Model Compatibility Ultegra 6800 0 compatible Fits 12 notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 45–47mm and a minor diameter (inside of notches) of 44mm and 36mm wrench flats
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