For the do-it-yourself dad who spends more time in the garage working on his bike rather than polishing it, BikeMaster brings you its Chain Breaker. Simply put, you can’t replace a worn and stretched chain without a tool like this. The BikeMaster chain breaker fits chains from 420 through 630 and comes standard with 3.5mm and 4.5mm hardened pins. The folding handle makes for a compact design, and the tool is covered by a lifetime warranty. More about the chain breaker is available at BikeMaster.com, while purchases can be made at various online stores or brick-and-mortar locations.