The Shimano HG CS6500 12T 9 Speed Lockring With Washer is a high-quality component for bicycles designed for 9-speed rear cassettes. This lockring, made by trusted brand Shimano, is essential for securing the cassette onto the wheel and ensuring smooth gear changes during cycling. The addition of a washer provides extra protection and functionality, making this product a reliable choice for avid cyclists looking to maintain their bike's performance.