I often find myself asking, "What hook should I use?" This was even more common when I was a beginning fly tyer. Now that I have more of an idea what to use, what about the crazy codes used by the different companies? What's the difference between the TMC 206BL and the Daiichi 1140? Seems like jibberish to me, but that's how it's done. I discovered this chart here and it has helped me out. It shows you comparable hooks between companies. Hope this helps!