Interesting experience with a hole saw, spring loaded rather than regular one where you unscrew the base to clear it. Dunno if it was because of the relatively long depth to narrow hole size or the mixed materials but it didn't clear when it exit the other side and when I released it with a screw driver it shot the plug out across the room like a shotgun slug with enough force to leave a mark on the wall it hit! good thing I wasn't point it at my face :s