This is a chain tool for motorcycles. I'm thinking somewhere between 420 and 530 chains (meaning any chain over 420 will do). He doesn't make bike chains, but does make a chain between a 420 and a bike chain (those infamous chains for 25/33cc bike engine kits (aka 49/66/80/100cc kits sold online) ) also worked. This tool can remove chain links by pulling out small rods. You can also use this tool to insert a rod, but that's pretty tricky. With large chains, it is almost impossible to get the bar back into the chain with this tool, so using a hand press is recommended.
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