The modern standard for squarebill crankbaits.

1. Deflects Without Kicking Out – So Even Tight-Holding Bass Commit

The Master Crank is built with true cover cranking in mind. It tracks straight and holds its line, allowing you to run it exactly where you aim—tight to wood, rock, and hard cover.

In situations where rain has stained the water and bass are glued to cover, it’s critical that the bait doesn’t violently ricochet away when it makes contact. If it jumps too far off the target, you lose the strike zone.

That’s why the Master Crank features a squarebill designed to deflect smoothly instead of sharply kicking out. It rolls off cover and continues swimming as if it’s “feeling” along the bottom or structure.

Both the SR and MR models use a durable circuit-board bill, giving them the toughness needed for repeated contact with rock and riprap.

It’s not just about hitting cover.

It’s about continuing to track true after the hit—so bass sitting tight to structure will still commit.

2. OMS Starts Swimming Instantly – No Time to Inspect

The Master Crank is the first crankbait to incorporate JACKALL’s proprietary OMS (Out Metal System), previously used in the TN series.

By positioning the weight outside the body, OMS achieves an ultra-low center of gravity while increasing internal air volume for added buoyancy.

The biggest advantage of this design is immediate startup.

With any lure, there is a split second between splashdown and full swimming action. In that brief moment, bass—especially those positioned tight to cover and watching upward—can reject the bait.

The Master Crank begins swimming almost instantly after it hits the water, eliminating that hesitation window and reducing the chance of being inspected and refused.

3. Tight-Pitch Action for Today’s High-Pressure Fisheries

JACKALL once had a legendary squarebill called the Aska. Though now discontinued, it built a strong reputation in its time.

However, today’s fisheries are undeniably more pressured. Increased angler traffic and constant information flow have made bass more conditioned and selective.

With that reality in mind, the Master Crank’s action is intentionally refined. Instead of an overly aggressive wobble, it delivers a controlled, tight-pitch action that moves water without overpowering the fish.

It grabs water cleanly, maintains presence, but avoids excessive flash or vibration.

This is a squarebill redesigned for modern, high-pressure conditions.

4. Improve Your Results by Rotating SR and MR

The SR is built to run around 3 feet, making it ideal for covering shallow flats and working over weed tops with consistent speed.

The MR reaches down to roughly 6 feet. It excels in mid-depth zones and can also be crawled slowly in shallow water, using its buoyancy to rise over cover and avoid snags.

The difference isn’t just depth. Each model pushes water slightly differently, giving you options based on clarity, cover, and fish mood.

Rotating between SR and MR based on conditions will stabilize your catch rate.

5. When You Need Even Less Action, Choose the Block Ripper

BLOCK RIPPER 48MR [Brand New]

$19.99

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Rotating between SR and MR based on conditions will stabilize your catch rate.

While the Master Crank represents the modern standard squarebill, the Block Ripper leans further toward finesse with a softer vibration profile.

Use it when pressure is extreme, the water is clearing, or fish demand a more restrained action.