In over 45 years of riding I have never broken a chain on the road either but the little Park chain tool remains in my small under-seat pouch. It keeps company with a spare tube, a Park self-sticky patch kit and my trusty PB Swiss Tools multitool (pictured above). For shop use I have a Hozan C371 chain tool that was made in Japan. Just a crazy great quality tool, like what Dura Ace is to bike components.