Originally Posted by Obamalamadingdong

No lock is "pick proof" but these Mercedes locks are very, very difficult to pick. 8 or 10 leaves and often times at least one pair of split leaves, that means one of the normal brass leaves is replaced by a leaf that is made up of two parts so that the cylinder won't be able to turn unless the key's upper and lower cuts simultaneously disengage the two leaf halves both the upper and lower. You'd have to pick the topside free then while holding tension to keep those leaves, find and access only the troublesome "half leaf" of the opposite key track.