If you have a masterlink in your chain, then you need these. So much easier than grabbing the chain with your hands and trying to wiggle the link to release. Keep your hands clean and your chain from getting torqued.
I have removed shimano, kmc, and sram master links easily. I finally broke down and got a pair after getting tired of pulling on strings to release links. These pliers are too big to fit in a flat pack but nice to have at the workstand.
I always clean my chains off the bike. Pull the dirty one off, put it in the soup for a few days, and put a clean spare on. I had been using a vicegrips to open the master link. The 11 speed chains are way hard to open by hand. The tool takes the fuss out of opening the master link, and doesn't offer the threat of damage .That vicegrips approach seemed prone to damaging things.
I finally woke up to the fact that master link chains have evolved since I was a kid, and are competitive with rivet chains in quality and are much quicker to install, and can be removed and cleaned making them long lasting. It took me a little longer to wake up to the fact that this specialized tool makes the process much, much easier. Don't be like me, if you are using master link chains make your life easier and buy this tool.
If you have ever fought with a well seated quick link or clean your chain often, you will appreciate these pliers. I deal with glacial silt that accelerates wear on bike components, so I remove the chain frequently. Nice tool with Park quality.
I've been using quick connect links since they first came out. I clean my chains on a regular basis and these links make the job easier. I've always struggled a bit to get the links off. I tried using my bare hands; works only if the chain is really, really clean. I've tried needle nose pliers; I've had them slip and pinch my hands leaving blood blisters. Then this tool came along. I've only used it once, but it was so easy to use that I have to wonder why I didn't buy it sooner. If you clean your chain often and have a quick connect link, get this tool to make the job easier.