I recently purchased an old gas grill that was converted to run on natural gas. To convert it back to propane I needed jets with a smaller bore. I was able to find a company that sells replacement nozzles but they have smaller holes that you will need to adjust to suit your needs. These drills were just what I needed for the job. Despite being as careful as possible, I broke a few of them in the process. But considering how small and fragile they are, I wouldn't give them credit for that. Bottom line, they worked great and my grill is alive again.