hook.terminal · part
Mustad Demon Perfect Circle
A true circle: the point turns fully perpendicular to the shank, so it slides to the jaw hinge and sets itself when the fish turns.
Verified destination: Demon 39944 inline · 1/0 · 8 pack (2026-10-20). Other sizes or packs are not verified by this link.
Open a clean build in the studioWe asked the solver to build a rig around the Mustad Demon Perfect Circle for all 75 fish-and-water pairs we publish. 49 clear every engine check, 8 carry warnings, 4 carry errors, and for 14 there is no size of it that fits the fish.
- clean
- 49
- warnings
- 8
- errors
- 4
- no size fits
- 14
Runs at #1 to 7/0 across its clean builds.
tradeoffYou must not swing. Reel down steadily and let it load. Every fish you miss on a circle hook, you missed by setting the hook.
- Sizes
- #1 – 10/0
- Style
- circle
- Wire ×std
- 1.20
- Eye
- ringed
- Eye ID mm
- 2.60
- Straightens at
- 90 lb
- Barbless opt
- no
- Salt rated
- yes
- Street price
- ~$9
What the solver builds around it
The most common pick at each other stage, across the 57 builds around the Demon Perfect Circle that clear without an error.
- mainline.connectionStren Original Copolymer28/57
- leader.connectionYo-Zuri HD Carbon Fluorocarbon Leader31/57
- reel.platformOkuma Ceymar Spinning Reel28/57
- rod.platformUgly Stik GX2 Spinning Rod29/57
- lure.platformBerkley Gulp! Shrimp29/57
- weight.terminalBullet Weights Lead Bullet Worm Weights38/57
- float.terminalPlastilite Water-Fill Casting Bubble4/57
Every fish, every water
Each row is the best rig the solver can build for that fish in that water while being forced to use the Mustad Demon Perfect Circle. "Adds" lists the engine problems it brings that the free solve for the same pair does not have, and the last price column is the cost against that free solve.
| Fish | Water | Size | Engine | Adds | Build | vs. free |
|---|---|---|---|---|---|---|
| Largemouth Bass | Farm Pond | 2/0 | clears every checkstudio | nothing over the free solve | ~$147 | +$4 |
| Largemouth Bass | Weedy Lake | 2/0 | clears every checkstudio | nothing over the free solve | ~$147 | +$4 |
| Largemouth Bass | Clear Reservoir | 2/0 | clears every checkstudio | nothing over the free solve | ~$147 | +$4 |
| Largemouth Bass | River Run | 2/0 | clears every checkstudio | nothing over the free solve | ~$150 | +$4 |
| Largemouth Bass | Big River Channel | 2/0 | 1 warningstudio | nothing new; the free solve carries the same flags | ~$147 | +$4 |
| Smallmouth Bass | Clear Reservoir | 1/0 | clears every checkstudio | nothing over the free solve | ~$118 | +$5 |
| Smallmouth Bass | River Run | 1/0 | clears every checkstudio | nothing over the free solve | ~$130 | +$5 |
| Smallmouth Bass | Big River Channel | 1/0 | 1 warningstudio | nothing new; the free solve carries the same flags | ~$118 | +$5 |
| Rainbow Trout | Farm Pond | – | no size fits | No Demon Perfect Circle size reaches the Rainbow Trout window (#14 to #4); it runs #1 to 10/0. | – | – |
| Rainbow Trout | Clear Reservoir | – | no size fits | No Demon Perfect Circle size reaches the Rainbow Trout window (#14 to #4); it runs #1 to 10/0. | – | – |
| Rainbow Trout | Mountain Creek | – | no size fits | No Demon Perfect Circle size reaches the Rainbow Trout window (#14 to #4); it runs #1 to 10/0. | – | – |
| Rainbow Trout | River Run | – | no size fits | No Demon Perfect Circle size reaches the Rainbow Trout window (#14 to #4); it runs #1 to 10/0. | – | – |
| Rainbow Trout | Hardwater / Ice | – | no size fits | No Demon Perfect Circle size reaches the Rainbow Trout window (#14 to #4); it runs #1 to 10/0. | – | – |
| Brook Trout | Mountain Creek | – | no size fits | No Demon Perfect Circle size reaches the Brook Trout window (#16 to #7); it runs #1 to 10/0. | – | – |
| Brook Trout | Hardwater / Ice | – | no size fits | No Demon Perfect Circle size reaches the Brook Trout window (#16 to #7); it runs #1 to 10/0. | – | – |
| Walleye | Weedy Lake | #1 | clears every checkstudio | nothing over the free solve | ~$123 | +$7 |
| Walleye | Clear Reservoir | #1 | clears every checkstudio | nothing over the free solve | ~$118 | +$4 |
| Walleye | River Run | #1 | 1 warningstudio | nothing new; the free solve carries the same flags | ~$123 | +$7 |
| Walleye | Big River Channel | #1 | 1 warningstudio | nothing new; the free solve carries the same flags | ~$118 | +$4 |
| Walleye | Hardwater / Ice | #1 | clears every checkstudio | nothing over the free solve | ~$118 | +$4 |
| Northern Pike | Weedy Lake | 4/0 | clears every checkstudio | nothing over the free solve | ~$150 | +$7 |
| Northern Pike | Clear Reservoir | 4/0 | clears every checkstudio | nothing over the free solve | ~$150 | +$7 |
| Northern Pike | Hardwater / Ice | 4/0 | clears every checkstudio | nothing over the free solve | ~$150 | +$7 |
| Muskellunge | Weedy Lake | 7/0 | 1 warningstudio |
| ~$432 | −$9 |
| Muskellunge | Clear Reservoir | 7/0 | 1 warningstudio |
| ~$432 | −$9 |
| Muskellunge | River Run | 7/0 | clears every checkstudio | nothing over the free solve | ~$432 | +$4 |
| Channel Catfish | Farm Pond | 3/0 | clears every checkstudio | nothing over the free solve | ~$148 | +$4 |
| Channel Catfish | Clear Reservoir | 3/0 | clears every checkstudio | nothing over the free solve | ~$148 | +$4 |
| Channel Catfish | River Run | 3/0 | clears every checkstudio | nothing over the free solve | ~$233 | +$4 |
| Channel Catfish | Big River Channel | 3/0 | clears every checkstudio | nothing over the free solve | ~$233 | +$4 |
| Blue Catfish | Clear Reservoir | 7/0 | clears every checkstudio | nothing over the free solve | ~$427 | +$50 |
| Blue Catfish | Big River Channel | 7/0 | clears every checkstudio | nothing over the free solve | ~$368 | +$4 |
| Crappie | Farm Pond | – | no size fits | No Demon Perfect Circle size reaches the Crappie window (#12 to #4); it runs #1 to 10/0. | – | – |
| Crappie | Weedy Lake | – | no size fits | No Demon Perfect Circle size reaches the Crappie window (#12 to #4); it runs #1 to 10/0. | – | – |
| Crappie | Clear Reservoir | – | no size fits | No Demon Perfect Circle size reaches the Crappie window (#12 to #4); it runs #1 to 10/0. | – | – |
| Crappie | Hardwater / Ice | – | no size fits | No Demon Perfect Circle size reaches the Crappie window (#12 to #4); it runs #1 to 10/0. | – | – |
| Bluegill & Panfish | Farm Pond | – | no size fits | No Demon Perfect Circle size reaches the Bluegill & Panfish window (#16 to #8); it runs #1 to 10/0. | – | – |
| Bluegill & Panfish | Weedy Lake | – | no size fits | No Demon Perfect Circle size reaches the Bluegill & Panfish window (#16 to #8); it runs #1 to 10/0. | – | – |
| Bluegill & Panfish | Hardwater / Ice | – | no size fits | No Demon Perfect Circle size reaches the Bluegill & Panfish window (#16 to #8); it runs #1 to 10/0. | – | – |
| Common Carp | Farm Pond | 1/0 | clears every checkstudio | nothing over the free solve | ~$134 | +$6 |
| Common Carp | Weedy Lake | 1/0 | clears every checkstudio | nothing over the free solve | ~$134 | +$5 |
| Common Carp | Clear Reservoir | 1/0 | clears every checkstudio | nothing over the free solve | ~$134 | +$5 |
| Common Carp | Big River Channel | 1/0 | clears every checkstudio | nothing over the free solve | ~$219 | +$4 |
| Striped Bass | Clear Reservoir | 5/0 | clears every checkstudio | nothing over the free solve | ~$223 | +$4 |
| Striped Bass | Big River Channel | 5/0 | clears every checkstudio | nothing over the free solve | ~$308 | +$4 |
| Striped Bass | Open Surf Beach | 5/0 | clears every checkstudio | nothing over the free solve | ~$308 | +$4 |
| Striped Bass | Inshore Flat | 5/0 | clears every checkstudio | nothing over the free solve | ~$222 | +$4 |
| Striped Bass | Jetty & Pier | 5/0 | clears every checkstudio | nothing over the free solve | ~$308 | +$4 |
| Redfish | Open Surf Beach | 4/0 | clears every checkstudio | nothing over the free solve | ~$308 | +$4 |
| Redfish | Inshore Flat | 4/0 | clears every checkstudio | nothing over the free solve | ~$222 | +$4 |
| Redfish | Mangrove Estuary | 4/0 | clears every checkstudio | nothing over the free solve | ~$223 | +$4 |
| Redfish | Jetty & Pier | 4/0 | clears every checkstudio | nothing over the free solve | ~$308 | +$4 |
| Speckled Trout | Inshore Flat | 2/0 | clears every checkstudio | nothing over the free solve | ~$207 | +$4 |
| Speckled Trout | Mangrove Estuary | 2/0 | clears every checkstudio | nothing over the free solve | ~$208 | +$4 |
| Speckled Trout | Jetty & Pier | 2/0 | clears every checkstudio | nothing over the free solve | ~$215 | +$4 |
| Snook | Open Surf Beach | 5/0 | clears every checkstudio | nothing over the free solve | ~$226 | +$4 |
| Snook | Inshore Flat | 5/0 | clears every checkstudio | nothing over the free solve | ~$222 | +$4 |
| Snook | Mangrove Estuary | 5/0 | clears every checkstudio | nothing over the free solve | ~$223 | +$4 |
| Snook | Jetty & Pier | 5/0 | clears every checkstudio | nothing over the free solve | ~$308 | +$4 |
| Flounder | Open Surf Beach | 3/0 | clears every checkstudio | nothing over the free solve | ~$307 | +$4 |
| Flounder | Inshore Flat | 3/0 | clears every checkstudio | nothing over the free solve | ~$222 | +$4 |
| Flounder | Mangrove Estuary | 3/0 | clears every checkstudio | nothing over the free solve | ~$222 | +$4 |
| Flounder | Jetty & Pier | 3/0 | clears every checkstudio | nothing over the free solve | ~$307 | +$4 |
| Tarpon | Inshore Flat | 7/0 | 1 errorstudio | nothing new; the free solve carries the same flags | ~$285 | +$4 |
| Tarpon | Mangrove Estuary | 7/0 | 1 errorstudio | nothing new; the free solve carries the same flags | ~$285 | +$4 |
| Tarpon | Jetty & Pier | 7/0 | 1 errorstudio | nothing new; the free solve carries the same flags | ~$380 | +$4 |
| Bonefish | Inshore Flat | 1/0 | clears every checkstudio | nothing over the free solve | ~$222 | +$4 |
| King Mackerel | Jetty & Pier | 5/0 | clears every checkstudio | nothing over the free solve | ~$310 | +$4 |
| King Mackerel | Nearshore Reef | 5/0 | clears every checkstudio | nothing over the free solve | ~$310 | +$4 |
| King Mackerel | Offshore Bluewater | 5/0 | 1 warningstudio | nothing new; the free solve carries the same flags | ~$310 | +$4 |
| Yellowfin Tuna | Offshore Bluewater | 7/0 | 1 errorstudio | nothing new; the free solve carries the same flags | ~$380 | +$4 |
| Salmon (Coho / King) | River Run | 4/0 | clears every checkstudio | nothing over the free solve | ~$234 | +$4 |
| Salmon (Coho / King) | Big River Channel | 4/0 | clears every checkstudio | nothing over the free solve | ~$234 | +$4 |
| Steelhead | River Run | 1/0 | clears every checkstudio | nothing over the free solve | ~$130 | +$4 |
| Steelhead | Big River Channel | 1/0 | 1 warningstudio | nothing new; the free solve carries the same flags | ~$133 | +$7 |
Fish-and-water pairs are the ones we publish solved rigs for: water type matches and the fish is actually targeted there. Build prices are street-price estimates from our catalog.
Where it falls short
The checks the Demon Perfect Circle trips that the free solve for the same pair does not, by how many builds each one fires in. The quoted line is the engine's own message from the first build it fired in.
Cast weight vs rod minimumwarn in 2 builds
Muskellunge, Weedy Lake: 0.75 oz is under the rod's 1 oz minimum. A rod casts by flexing under the weight it is throwing. Below 1 oz this blank never loads, so you get a short, weak, uncontrolled cast no matter how good your technique is.
Weight, bait and float together have to reach the bottom of the rod’s casting rating, or the blank never loads. The engine warns.
Where our rigs already use it
Pages where the solver picked the Demon Perfect Circle with nothing forcing it.
Against the other hook options
The same test run on every hook in the catalog, ranked by clean builds. Full specs side by side are on the hook comparison.
| # | Part | Clean | Warn | Error | No size | Price |
|---|---|---|---|---|---|---|
| 1 | Owner Mutu Light Circle | 52 | 14 | 4 | 5 | ~$10 |
| 2 | Eagle Claw Lazer Sharp Circle Sea | 49 | 8 | 4 | 14 | ~$5 |
| 3 | Mustad Demon Perfect Circle | 49 | 8 | 4 | 14 | ~$9 |
| 4 | Mustad O'Shaughnessy Siwash | 41 | 16 | 4 | 14 | ~$7 |
| 5 | VMC Barbarian Treble Hook | 34 | 20 | 0 | 21 | ~$8 |
| 6 | Gamakatsu Octopus Hook | 30 | 41 | 4 | 0 | ~$7 |
| 7 | Gamakatsu Superline EWG Worm Hook | 30 | 27 | 4 | 14 | ~$9 |
| 8 | Owner Jungle Flippin' Hook | 27 | 25 | 4 | 19 | ~$11 |
| 9 | Owner Mosquito Light Hook | 22 | 32 | 0 | 21 | ~$8 |
| 10 | Eagle Claw Aberdeen Light Wire | 9 | 28 | 0 | 38 | ~$4 |
| 11 | Daiichi Dry Fly & Nymph Hooks | 4 | 10 | 0 | 61 | ~$12 |
frequently asked
05What fish is the Mustad Demon Perfect Circle good for?
Built around it, the engine clears every check for Largemouth Bass, Smallmouth Bass, Walleye, Northern Pike, Muskellunge, Channel Catfish, Blue Catfish, Common Carp, Striped Bass, Redfish, Speckled Trout, Snook, Flounder, Bonefish, King Mackerel, Salmon (Coho / King), and Steelhead.
What size of Demon Perfect Circle should I use?
Across its clean builds the solver runs it from #1 to 7/0. The table on this page lists the exact size for each fish and water; the window comes from each fish's hook size requirement and the rod it is paired with.
What does the Demon Perfect Circle pair with?
Building around it, the solver most often picks the Stren Original Copolymer (mainline, 28 of 57 builds), the Yo-Zuri HD Carbon Fluorocarbon Leader (leader, 31 of 57 builds), the Okuma Ceymar Spinning Reel (reel, 28 of 57 builds), and the Ugly Stik GX2 Spinning Rod (rod, 29 of 57 builds).
Where does the Demon Perfect Circle fall short?
cast weight vs rod minimum (a warning in 2 builds, e.g. Muskellunge, Weedy Lake: 0.75 oz is under the rod's 1 oz minimum).
How does it compare with other hook options?
It ranks 3 of 11 hook options in our catalog by clean builds (49 of 75). The Eagle Claw Lazer Sharp Circle Sea clears as many or more (49) for less (~$5 against ~$9). Prices are street-price estimates, not live Amazon prices.