I have used this tool for well over 20 years. I use it several times per year, whenever I need to do plumbing repairs. I use it most commonly to loosen or tighten faucet strainers. Ordinary wrenches don’t work because they don’t have a large enough opening to wrap around the strainer. A large mouthed wrench can adjust its opening wide enough to remove or tighten the strainer without scarring it.

Submitted to Cool Tools by Dick Spencer