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If you are looking to remove sanded floor grout, this is not the tool for you. The attachment doesn't allow for full depth and the cutter lasted about one tile. I ordered this and along with it came one rotary diamond grout cutter.
I wasn't very deep, nor was I putting much pressure on it. Nicely engineered part. I have the whole day off to do this job and I am done 5 minutes into the project. I have made it less than three inches through the grout in my tile and the bit broke in half. The bit is shaped like a Q-Tip. Lets see how amazon's return policy is. It has a rounded end and then it gets very narrow, at which point mine busted.
The guides are not fail-safe, and when using a tool this aggresive, you need fail-safe. Also, as the bits wear -- which they do quickly -- the tendency to wander worsens. When using the system on floor tile, the guide tends to wander out of the grout groove, especially where four tile corners meet and aren't exactly true. I don't know how this system could be improved upon, but the risk of cutting into the tile just made me too nervous to continue using it.
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