In this case I'm putting a hackle on a very basic Green Rockworm pattern.
Hook, Allen 102BL or any similar hook, I really like wide gape barbless hooks and so that's what I use. Your standard nymph hooks will do a fine job as well.
Underbody of opal or pearl tinsel.
Body is vinyl D-rib green but use any color you like!
Hackle, genetic hen. I typically use a sort of speckled dark dun or grizzly. Black would be fine too! I like a oversize hackle as you can see.
Dubbing, black, either SLF or Life Cycle.
Thread is, as usual, Veevus 14/0.
I like start the body a little bit down the bend for this fly when using this type of hook, gives a nice effect.