Firehole Sticks 523: This hookis a 3XL version of the 516 and is available in sizes 4-14. To compensate for the additional leverage generated from the extended length the wire diameter is increased by one size, e.g. 523 #10 and 516 #8 have the same wire diameter.ForStones, crawlers, and balanced leeches. Also a a good hook style for small jig style streamers.