I bought this carbide drill to drill a 2" hole in about 8" of concrete. It is recommended to use water on the bit when drilling to prolong the life of the bit, which is what I did. I did it about two inches before this drill bit stopped drilling. By this time most of the carbide sand had been worn away. If you're wondering how to drill deeper than the drill bit, you'll need to chip the concrete to remove the "donut" before drilling deeper into your material. I know there are hole saws out there that will do exactly what I need, but they usually cost a lot more. I ended up with a Spyder carbide hole saw bit.