Sette ST-331 Screw Type Chain Tool
The Sette ST-331 Screw Type Chain Tool is small and compact so it's perfect for taking it along on your ride. You never know when a chain may break and when you're the only one with the tool needed to fix the problem you will be the trail hero. Small and light enough to keep in your back jersey pocket or in your seatbag.
I love this tool. I have two. One in my bag, one in my home shop. Works great. If you line up your chain properly in it, and hold it with one hand while torquing with the other, you should be able to get your chain broke and back together easily. If you do not line it up properly with the pin, I would see how you could break the tool but if you force anything, you'll break the tool. So I don't put much merrit in the other bad review. Maybe the guy's chain was being a bit of a tool when he tried lining it up or was in a hurry and didn't have it lined up right to remove the pin, who knows. If you line up the pin on the tool with the pin on the chain and make sure it's in line as you use it, you should not have a problem with it. I haven't yet.
Not the strongest chain breaker. Did the job twice and then busted on me. To give the benefit of the dought, I'm rough on tools.