This tool is used to break the chain in order to lengthen or shorten your chain when you make gear changes.
This #219 Chain Breaker has a wider pin spread. It can be used on all #219 Chain including the #219 Panther Chain. The Panther Chain has wider links and therefor will not fit in a lot of other chain breakers on the market. Keep in mind that the pins break often when not aligned properly. Pins are not a warranty item. It is a good idea to have an extra pin in your tool box.