The Thru-Axle Chain Keeper is an ideal solution for keeping your bike chain secure during bike washing tune-ups and traveling. This elegant lightweight bio-based plastic design fits perfectly on the axles of 12mm thru-axle dropout systems no tools required. By keeping chain tension with the Thru-Axle Chain Keeper you can be confident your bike is safe during drivetrain cleaning or travel.Fits 12mm Thru-Axle dropoutsPrevents the chain from slapping against delicate and painted frame surfacesHigh-density solvent resistant Bio-based PA56 roller is easy on your chain yet incredibly durableSAG Sustainability Action Group approved - bio-based material low packaging volume and mono-material for easy recycling