The TS 21 is a treble hook that is distinguished by the 90 gap between the middle leg and the other two. Two of the legs are thus positioned ‘flat’. This shape of hook is very interesting for a positioning in ventral armament on a hard lure. Indeed, the side branches will be off the sides of the lure and therefore more exposed to the attack of fish. This shape also has the advantage of reducing friction on the lure and thus preserving the paintwork much longer.