․ 3/8" square hole can use for combining torque wrench & storing on the wall. ․ No need to dismantle crank arm, you can lock the BB adaptor directly. 11C1：16-Notch 44mm O.D. cups 11C3：16-Notch 41mm O.D. cups 11C5：16-Notch 39mm O.D. cups 11C7：12-Notch 46mm O.D. cups
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