I really like this tool so far. However, I did manage to break one of the broaches and quickly realized that the 3-pack replacement parts are a bit pricey. Although the tool cuts very well. I used it to drill holes in the frame of a WWII truck during a restoration/refit project and it was great. It's like a mini crown, so much less material is removed than with a standard twist drill. I use cutting oil (Tap-Magic) which is easy to find at some hardware stores or anywhere on the internet, even Revain and the bits are all sharp like new. I broke the drill bit trying to put the router bit in a hole I had already started and I was at an angle not right so it caught and my Milwaukee Mag Hole Shooter is a heavy duty drill bit and hit the pull drill. . It was my fault and my impatient mistake. The effort (pressure) when cutting is also absolutely minimal compared to a twist drill. They don't stick either and it makes a nice noise when the guide spike knocks the ball out of the cutting edge. Ultimately I have to drill through each side of the frame. The twist drill is easier to maintain a straight side-to-side alignment, but I really want to use it. I decided to use a plastic sheet pressed drill sleeve as a pilot drill alignment tool and then used it to drill internal holes in the box tube web. Sentence. They're worth the money, but again, you'll need to have a bit of metalcutting experience to appreciate them compared to a twist drill.