Tired of kinky leaders and difficult to adjust strike indicators? Air Lock indicators are the answer. Super easy to use and super easy to adjust depth. Durable and easy to see on the water. All you do is remove the knob and place the leader in the notch between the vertical posts of the Air Lock indicator. Then simply replace the knob and twist to tighten. Done. Three 1/2" or 3/4" indicators per pack.