This is a solid drill. Long story short, I had a screw in my Trailblazer's gearbox. I tried using a puller and the puller actually broke leaving a piece of high speed steel in a pinched bolt. Great, isn't it? Well after trying various other things I finally got this drill and helicoil set. I was amazed at how easily this bit cut through anything that was snagged (a bolt and a piece of HSS extractor). I wish I had bought this drill sooner as initially I spent a lot more than the price of the drill on other options.