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Park Tool’s GSC-1 GearClean™ Brush has a unique design. A large comfortable handle with a curved, toothed-end reaches dirt deep between the gears, and tough nylon bristles clean the derailleur and chain. Saves wear and tear on your chain and freewheel. Works great on brakes or other places where dirt collects.
GSC-1 FEATURES
https://youtu.be/oYdMCc6o3TE
Are you looking for more information? Reach out to Paul, and he'll get right back to you!