Bushings are the only thing I could actually use from the kit and I needed them in a hurry so I didn't send it back. The rest of the kit is very cool, the hole saws are very thin and don't cut much more than probably plastic. I don't see them going through metals. and when i tried to use some plastic connectors they just broke in half. This may or may not work for you, but for $5 it did what I needed at the time.
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