Knuckleduster needed something built for one specific enemy, and a broker found it for him. The Taser Knuckle punches like brass knuckles and carries enough current to stop a heart, then reverses itself and starts one again.
The Taser Knuckle is an electrified weapon belonging to Iwao Oguro, the vigilante called Knuckleduster. It was made with a single opponent in mind, Kuin Hachisuka, and it reached his hands through the broker Kagero Okuta, known in the trade as Giran. The weapon debuts in Chapter 22 and Episode 11 of My Hero Academia: Vigilantes.
Nothing prevents the weapon from being swung as an ordinary pair of brass knuckles, but the electricity is the point. A shock delivered by grazing an arm or a leg is enough to freeze a target where they stand, and a blow that lands squarely on the chest can stop the heart outright.
An automated external defibrillator is folded into the same casing. Both functions run off electric batteries, so the weapon reverses its purpose easily enough: run its wires to a person's chest and the Taser Knuckle revives them rather than fells them.

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The Taser Knuckle is an electrified weapon belonging to Iwao Oguro, the vigilante known as Knuckleduster. It was built specifically to take on the villain Kuin Hachisuka and debuted in Chapter 22 and Episode 11 of My Hero Academia: Vigilantes.
The Taser Knuckle functions like ordinary brass knuckles but delivers an electric shock strong enough to freeze a target with a graze or stop the heart with a solid hit to the chest. It runs on electric batteries.
Yes. The Taser Knuckle has an automated external defibrillator built into its casing, so running its wires to a person's chest can revive them instead of harming them.
The Taser Knuckle was supplied to Knuckleduster by the broker Kagero Okuta, known as Giran, and was designed with the villain Kuin Hachisuka as its intended target.
Knuckleduster, whose real name is Iwao Oguro, carries the Taser Knuckle as his own weapon, and Soga Kugisaki later takes it up as well.
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