Review on Efficiently Tackle Hard Metal Projects With Aiyun'S 6-Pack Metric Drill Tap Set For Steel And Aluminum by Brett Robinson

Was working on a project and broke a bolt for the bumper assembly on my van. I had to drill out what was left of the bolt and as a result needed to retap the threads so I could put it all back together. That's where these bits come in. These bits are beyond awesome. After 20 to 30 minutes of slow drilling they not only cleaned out the hole but also left perfect threads for the replacement bolt. Very happy with these bits they got the job done and done right. After use there is visible ware on the bits as is to be expected. I'll likely be able to get multiple uses from the set. Would definitely recommend for similar projects. And remember, go slow don't rush it this is a tool for thread work and you want to do it right if you are going to do it, so take your time.