Keep your drivetrain in the best possible condition with the RNX Chain Scrubber kit. The RNX Chain Scrubber can be used on bike chains without removing the chain from your bike. Easily clean your bikes gears and chain at your home or garage. Just attach the RNX Chain Scrubber to the chain, fill the container with a cleaning solution (not included), and rotate the pedals to pass the chain through the internal brushes. The brushes scrub the chain, removing dirt, grime, and other debris that can accumulate on your chain over time. Use the gear cleaner and scrub brush to get in between the tight spots. Only takes minutes but helps improve the longevity and reliability of your bicycle's drivetrain.