I bought this tool out of necessity. I play with the car and take part in the fine-tuning. I'm in the process of tuning a custom carburetor that I built for my engine. After messing around with another brand of carburetor that wasn't right for my application, including frequent injector changes, I got tired of destroying injectors with a flathead screwdriver. I didn't plan on repeating the problems I caused with my new carburetor, so I bought the tooling when I bought the jet set. This is the right tool for the job. No more spoiled jets.