Durable Material: Made ofhigh quality aluminum alloy, our Thru axle hub adapter is lightweight but durable,non-deformation,durable for long time use. Multiple Size: 12 MM to 9MM Thru Axle Hub quick release. Please measure the opening length of your bike hub, and then determine the diameter of the middle hole of the hub before purchasing. Stable Design: Both sides of the product are equipped with rubber rings, which can reduce the shaking and be protective, so that the Axle Hub Adapter and hub are tighter. In addition, each package comes with extra 4 rubber O-rings. Easy to install: Very easy to install, just insert the adapter into the thru axle hub. Reliable Customer Service: always focuses on product quality and service. Any questions, please feel free to contact us. We are here ready to help.