Flies are tied so the hook lies point up in the water. A hook riding this way will snag less frequently on the bottom. That allows a fly fisherman to fish deeper with a streamer or nymph imitation without losing as many flies and increasing the chances of hooking a fish.
In this example, I am using .035 lead wire and 6/0 tying thread. Lighter lead wire can be used as long as there is enough to turn the hook over and cause it to ride point up.
To prepare a hook, you need to create a "pyramid" with three layers of lead wire. Leave room at the head of the hook to tie in materials and finish the fly.