The engineers at KMC constructed this tool to make the installation and connecting of the KMC MissingLink (or any chain connecting link) and easy and precise task. Simply attach and align the two plates of the align outer plates of the master link, then attach the tool in between the plates and apply pressure to the handles. The link will snap right into place with ease. Simple, effective and more accurate and civilized than setting the link by applying pressure to the drivetrain. This KMC tool is a must for any serious mechanic.