Very nice tool that makes servicing o-ring chains a lot easier. The master link on o-ring chains is very tight and difficult to remove and reinstall the link plate without extra prying or sqeezing. No more hassle with this and it only takes less than a minute to use once you get the hang of it. Not needed for non sealed chains.
Do not go without one of these. Just press the master link sideplate on evenly and watch carefully not to smash the O ring or x ring. Check with the edge of the clip to see if the groove is exposed just enough to slide on the clip .Be sure to install the clip so the closed end is in the direction of rotation.
You can for sure get by with a c-clamp and a socket for pushing links on...and you can get by with a flat screwdriver for removing links. But that's not what this tool is about. It's about making the process easy and ensuring that you won't damage your chain if you're removing and reinstalling it. This tool is a joy to use.
It's also about being blue anodized aluminum. Can't forget that.
So if you want a sweet piece of blue anodized aluminum for one specific task, then this is the tool for you. Just buy the dang thing.