Hayabusa H.MAG188 BN

The magnum circle — the heavy end of the circle hook range, built for big baits and fish that pull hard enough to open lighter wire.

The circle geometry is unchanged: the point turns back to the shank, so the hook takes hold in the corner of the jaw as the fish turns away. What changes is the gauge, and with a large bait on a heavy trace that is the thing that decides whether the hook comes back the shape it went out. Forged high carbon steel, chemically sharpened, black nickel.

Hayabusa scale drawing: hook profile, European and Japanese size ladders, and how the hook is built
Hayabusa's own scale drawing for this pattern — the profile against a 1cm square, both size ladders, and how the hook is built.