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The Park Tool BBT-35-12 Bottom Bracket Tool is built for clean, secure bottom bracket installs and removals with a precise, no-fuss fit. It works with 12-notch external bottom brackets sized 4850 mm (46.3 mm minor diameter), giving solid engagement for controlled torque application. A 3/8″ drive interface makes it compatible with ratchets and torque wrenches, as well as Praxis Works M30 systems.