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.
- 1C1：16-Notch 44mm O.D. cups
- Product Dimensions : 15x8x0.4cm
- Weight : 0.31kgs
- Color : Silver / Black
- Material : Cr-Mo Steel