It can replace freewheel for bike repair or chain clean. Insert into the rear dropouts and tighten the quick release. Made of high-quality material, durable and practical to use

Features:

• Easy to Use: Simply remove the rear wheel off the bike. Clamp the chain keeper or dummy hub on the drop-out. Keeps chain out of the way when transporting or wrenching on your bike.
• Dual Function: It is compatible with quick release drop out and 12mm thru-axle.
• Clean & Transportation: YC-521 can be replaced freewheel for bike repair or chain clean Inserted into the right rear dropout when the wheel is removed for cleaning, storing, or transport.
• Compatibility: The quick-releaselever allows for fast installation and removal. Works with all derailleurs and 1/8″ chain, works on frames with 9mm open-type dropouts. Suitable for all derailleurs and chains
• Material: Aluminum alloy, plastic