You will need a grinder for chains 520 and larger
BikeMaster Heavy-Duty Chain Breaker & Rivet Tool
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Spending the extra money on this chain breaker is a good decision. Follow the directions and pay attention and this tool will last a long time. Some of the cheaper ones will not last no matter how careful you are with it. The directions for this tool are not the greatest.
This item is easy to use and you can tell it was made with quality in mind. Items like this you should never go cheap on because you can tell when you use it that it works like it should.