as dommyracer said the Opi No. 5 with a 60mm blade does not have a lockable ferrule. Or buy a NO. 6 with 73mm blade and simply remove the ferrule. Best single blade knife for the price and type. I prefer the reassurance of the locking function so put the ferrule back on when I am back in France or out in the countryside.anthonyyy said:I like Opinels; but are Opinels without a locking ring safe? I nearly chopped me finger off a couple of times when I forgot to lock mine.