EPCO Studio-North American series is an advanced Studio Lever Lock.While Keeping the same minimal dimensions of length and width as classic Studio-Texas, the bolt throw is 25mm(1") length and is able to fully retract inside the lock body.
If the bolt is not fully extended and deadlocked, the key cannot be taken out from the cylinder. This allows the user to be aware of any obstruction in the bolt keeper or receiver which would otherwise compromise security.