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The socket can increase contact area between wrench and B.B. shell, especially for lightweight B.B.
Disassemble and install Shimano® Hollowtech II, Truvativ® GXP, FSA® MegaExo, Campagnolo® Ultra-Torque, TOKEN® and many other external bearing crank set bottom brackets.
Spec: Bottom bracket wrench includes a crank installation tool, TB-8911.