the loop or ring (that I have seen on some fixed blades) attached to the handle of the knife right below the blade? If holding the knife in the palm of your hand (blade pointing upright) the user would be able to insert their index finger into the loop, allowing them to twirl the weapon in the palm of their hand. Is this an after maket attachement or are there knives that come equipped with this feature? I ask because I saw a knife similar to this in the movie Tombstone (Starring Kurt Russel & Val Kilmer) being used by one of the bad guys wearing the red sash around his waist. Anyone with any clues please advise...thanks!