product description : Have you ever experienced a chain drop while cycling? So I designed this "tool". With this tool, you don't need to be full of oil, and you can also solve the falling chain and the broken chain at the same time. This tool has the functions of chain drop repair and chain hooking. The ergonomically designed handle allows users to easily grasp the tool for easy operation. The hook chain is designed with a tenon, which hooks the chain securely and safely handles broken or dropped chains.