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3D-printed | Recycled plastic | Suitable for 12 mm thru-axles | Portable | Planet Friendly. Cleaning your drivetrain is a breeze with the Pocket Sprocket. Simply slide it over your 12 mm thru-axle, put the chain in the groove and clean or lubricate your chain, chainrings and derailleur with ease. Application : Remove the rear wheel from your bike. Insert the thruaxle in the non-driveside of the frame and slide the Pocket Sprocket over it. Route the chain in the groove of the pocket Sprocket and tighten the thruaxel into the driveside of the frame, like you would when installing your wheel. Now you can clean your drivetrain with ease or safely transport your bike.