The 1640 has has found many uses as a dry fly hook. However it’s standard wire, 2X-short shank & the straight-eye makes this hook ideal for all sorts of trout tube flies. Daiichi Fly hooks are the finest in the world. Here's why: They are made of the finest high carbon steel, which is hardened and tempered to an exacting formula that makes for a long point life and a very strong hook. Daiichi hooks use a 12-degree constant taper ground needle point.
Daiichi 1640 100 Count Box - THE FLY FISHING STORE
1640 Tube Fly Hook - 25 hooks - size 4 : Sports & Outdoors
Ron Eagle Elk's Content - Maine Fly Fish
Hooks & Shanks
Understanding Dry Fly Hook Comparisons - RiverKeeper Flies
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Daiichi 1640 Fly Tying Hook - AvidMax
Ever since “Catch-and-Release” became the popular trend of fly fishers, some individuals have touted the idea of a barbless hook. The advantage being that the fisher need not pinch down the barb. Contrary however to common logic, studies of hooked fish in Idaho and Oregon have confirmed that barbless hooks can actually inflict more damage to a fish than barbed hooks. Therefore, barbless dry fly hooks are less popular (or practical) than dry fly hooks with mini-barbs. Bronze finish.
Daiichi 1190 - Barbless Dry Fly Hook 10
Daiichi 1640 This multi-use hook has a 2X-short shank and an offset bend for better hook ups.
Daiichi 1640 Multi-Use Dry Fly Hook
Daiichi 1640 Multi-Use Hook - Duranglers Fly Fishing Shop & Guides