Product name: for SRAM DUB crank washer Product size: The inner diameter is 2.89cm/1.13inch the outer diameter is about 4.88cm /1.92inch and the thickness is about 0.75cm/1.13inch Product color: As shown in the figure Product material: aluminum alloy product features: 1. It is made of high-strength aluminum alloy, durable and able to withstand high pressure. 2. Easy to install, fast and easy to adjust, and easy to install at the crankshaft of your bicycle. 3. The product is corrosion resistant and can be used in harsh environment, so you don't have to worry about whether the place where the product is riding is corrosive. 4. It is applicable to SRAM DUB, so you don't need to worry about the mismatch. 5. Our products not only have high cost performance, but also integrate the above advantages, which is more conducive to your riding experience. 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 for SRAM DUB crank washer