What it is
Hareline Core C1270 is a curved nymph hook with a long, curved shank that naturally sets up slim-to-bulky bodies with a bent profile. It has a chemically sharpened point and a small barb, and it runs from sizes 4 through 24.
What to tie with it
Use it when you want length plus a curve: long-bodied nymphs, larvae, scuds, and midge patterns all sit nicely on this shape, and it’s a clean base for caddis emerger-style ties. It also crosses over into certain dry flies where a longer shank helps build a bigger silhouette, like large terrestrials, large-bodied stoneflies, and a Stimulator.
Flies and the fish they're for
The Stimulator is a classic attractor dry that gets fished for trout in rivers and pocket water when you want a big, high-floating meal that suggests stoneflies or big caddis. On the curved nymph side, this hook style is a natural fit for caddis larva and caddis emerger patterns, which are bread-and-butter trout flies in freestones and tailwaters, especially when fish are keying on drifting larvae or emerging insects.
How it compares
It shares a similar profile and bend with the Daiichi 1270 Multi-Use Curve Hook, but the C1270 is offered down to size 24 while the Daiichi 1270 goes to size 22.