Features1Two Stage Design: Bike hub parts adopt a unique two stage design with adjustable length, supporting hubs from 142 to 148mm. 2Tapered Head: Both ends of the bike hub shaft are tapered, which is compatible with most of the fixed holes of the riding platform. 3Aluminum Alloy: Bike hub rear shaft is made of aluminum alloy, with CNC machining to ensure the strength and accuracy of the product. 4Protection: Bike rear wheel hub axle with washers according to the shape of frame hook and claw, used to defend frame hook and claw. 5Easy to Install: Bike hub shaft is easy to install and remove, quick installation and repair, so you have a better riding experience.SpecificationItem Type:BikeRearHubAxleMaterial: Aluminium AlloyPackage List1 xBikeRearHubAxle2 x Wrench