When you say "A bolt with a 19mm head on it", do you mean a bolt that requires a 19mm wrench (or socket) to turn it?
Forgive me if I'm being obtuse...but I've run into this problem before when someone asked me for a 3/4" bolt, when he meant to say a 1/2" bolt - that is removed with a 3/4" wrench.
Forgive me if I'm being obtuse...but I've run into this problem before when someone asked me for a 3/4" bolt, when he meant to say a 1/2" bolt - that is removed with a 3/4" wrench.