What it is
The Hareline Core C1720 is a streamer hook with a long shank and a down eye. It’s built around the proportions you want when you need extra body length without jumping to an oversized hook gap.
What to tie with it
Use it for classic streamers, especially featherwing and hairwing patterns where you want room for layered materials and a clean head behind a down eye. It also fits sculpin-style imitations and all the standard Wooly Bugger-style builds where you’re palmering hackle and laying in chenille, dubbing, or other body materials along a longer shank.
Flies and the fish they're for
Mickey Finn is a staple featherwing streamer on a long-shank down-eye hook like this, fished for trout in rivers and for landlocked salmon where they’re stocked or native. The Wooly Bugger is a do-everything streamer that covers trout in freestones and tailwaters, smallmouth bass in rivers, and even panfish in ponds and lakes. Both patterns take advantage of the long shank for a longer profile while keeping the hook size reasonable.
How it compares
It’s similar in layout to the Daiichi 2220 4X-Long Streamer Hook, with the same long shank and down eye. One practical difference is sizing: the Daiichi 2220 runs down to size 1, while the Core C1720 stops at size 2.