The ones I broke were wood ones.
He's got a pretty extensive set, so I don't want to buy a big one, just a small to medium sized set. A couple of his other bits are dull, so it would be nice to get a set from small to large sizes but not alot of pieces. He doesn't need a 72piece set....more something like a 20 piece set.
Never argue with an idiot, they will drag you down to their level then beat you with stupidity