This ultra-durable and super-reliable Birzman bottom bracket socket tool is designed for use on Shimano Cartridge bottom brackets or other similar 20-notch, 31.6mm-diameter models, making installation and removal easy and hassle-free. Constructed from strong and corrosion-resistant alloy steel, this essential maintenance tool installs and removes cartridge bottom brackets with precision.
Specification:
- Functions: 1/2″ Dr.
- Material: Alloy steel.
Occasionally, without notice, manufacturers change product design and/or specifications.




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