Park Tool - GSC-3 Drivetrain Cleaning Brush S3-screwdriver set for cleaving the air with

for cleaving the air with unprecedented aerodynamic efficiency

lock mounts and can be directly adhered to phones

For RVC (removeable valve core) Tubes/Tubulars

Bidirectional

Park Tool - GSC-3 Drivetrain Cleaning Brush S3-screwdriver set for cleaving the air withPARK TOOL GSC 3 DRIVETRAIN CLEANING BRUSH This dual sided brush is specifically designed for cleaning hard to reach areas of the bicycle drivetrain. The long, stiff bristles of the GSC 3 are narrow enough to reach between the gears of tightly spaced modern cassettes, while the slim contoured end is capable of picking grit and grime out of tight spaces such as derailleur pulley wheels.