Product name: chain tensioner Product size: 2.38*2*1.8*1.2cm/0.93*0.78*0.70*0.47inch Product color: As shown in the figure Product material: alufer product features: 1. It is widely used to tension the chain and prevent the chain from jumping to ensure smooth driving 2. CNC machining Fully automatic CNC turning has high surface finish, roundness and brightness. 3. You can choose more colors to make your bike more beautiful and moving. 4. Anodize the surface with bright color to protect the aluminum alloy body 5. At the same time, it is easy to install as long as the screws are removed. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can feel free to contact mewe will give you some suggestion, but it is for you reference only. Shipment includes: 1 pc chain tensioner