Drilled 13 holes in 2" to 6" thick jaw without much trouble, although hooked 6" jaw a few times (4 pins). ) and since I've already gone through a bolt I can't move it to widen the hole so it takes a forward/backward movement to get through. I then attempted to drill a hole in the 10" thick maple wood, for which it didn't stick well and ended up breaking, see photo, and I had to split the wood to get the drill head out. so heavy but when you look at the break it's clear it's glued and not welded and that's why I'm giving it one star. Also, I think the drill head could be better if it were slightly tapered (bigger?) backwards to minimize sticking.