Duke Dog-Proof Trap Setting Tool, this simple setter allows you to easily set the dog proof trap in your hands. Simply position the setter so the two notches are underneath the bar that holds the trigger. Position the dog of the Duke trap between the legs of the setter. The far end of the setting tong rests against the spring-powered strike bar of the trap. You now have a "handle" to compress the strike bar and easily engage the dog in the notch of the trigger.