Specifically for Shimano Nexus hubs. This anti-rust connecting link is custom-made for chains used on bikes with a Shimano Nexus gear hub. The link is weather-resistant and simply clicks into place. The Simson Connecting Link Anti-rust for Nexus has a size of 1/2x3/32. With this connecting link, a broken or new bicycle chain can be easily connected. You use this connecting link for bicycle chains of bikes with a Shimano Nexus gear system, such as the Simson Chain for Nexus. You click the connecting link onto the end of the chain without the use of tools.