Shimano CJ-7S40 Cassette Joint allows you to shift gears smoothly and efficiently with its Revo-shift lever. Designed for use with Inter-4 hubs, it provides a wide range of gear options for various riding conditions. The indicator on the lever clearly shows the current gear position, making it easy to keep track of your shifting. Installation is straightforward, with clear instructions and diagrams provided. Remember to follow the service instructions carefully to ensure proper functioning and avoid potential safety hazards.