Material: Made of good quality aluminum alloy material, anti rust, high strength, , sturdy and durable, colorfast, lightweight .
Functaional: Can protect the crank from scratches, water and dust, Used for inner dia 22-25mm integrated hollow crankset(crankset side) .
Wonderful Accessory: for bike chainwheel, used crankset and crank of the chain wheel, Tighten, waterproof.
Washer: Use Double washer, Compatible with 21-23mm inner diameter cranksets .
Universal: Can be applied for mountain bikes, road bikes, etc .