The ligatures are adjusted for standard mouthpieces sizes, usually, only the belt screw needs to be adjusted:
J: Belt screw, allows to tighten the belt around the mouthpiece once positioned, the less you tighten, the more you release the harmonics
K: Nuts, to lock the side screws
L: Side screw, to adjust the ligature to specific mouthpiece sizes. Both screws must be tightened or loosened symmetrically
M: Base screw, it holds the base on the belt. It must remain tight to the maximum
N: Pliers
O: Location for tightening the nuts (and the small base screw for Bb & A/Eb clarinets and soprano saxophone)
P: Location for tightening the base screw