The TS 21 is a treble hook distinguished by the 90° gap between the middle tine and the other two. Two of the tines are thus positioned "flat". This hook shape is very interesting for belly-mounted rigging on a hard lure. Indeed, the lateral tines will be lifted away from the sides of the lure and therefore more exposed to fish strikes. This shape also has the advantage of reducing friction on the lure, thus preserving its paint finish for much longer.