Uses: Hoppers, Terrestrials, Stonefly Nymphs. Bronze, York Bend, Straight-Eye, Standard Wire, 3X-Long Shank, Forged. The york bend was developed by Daiichi to simulate a more natural looking curved hook. Many tiers feel that these curved hooks impart amore life like natural appearance in the flies they create. This 3X-long model is perfect for bead head nymphs, hoppers, and other dry flies.