This Parachute Iron Blue imitation is tied on a barbless AHREX FW503 in a size 16.
The Parachute style of Iron Blue you see here is tied to imitate the insect which has hatched and is resting on the surface, waiting for its wings to dry out - this is an ideal time for a trout to intercept it (as it cannot escape). Only fish this pattern (and the Iron Blue Upright) once you can see fish rising.
When fishing with a parachute-style fly only apply floatant to the post, as you want the fly to fish in the surface film (not riding high on it like the Iron Blue Upright).
This fly is only available in a size 16.