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Following this video.

Is it effective to carry and use a carabiner as self defense in real fight? Does it endanger your knuckles and could it break them when you hit your opponent? If it is recommended, what are the recommended characteristics and dimensions of that carabiner? (i.e. what material does it have to be made of? What is the recommended KN - kilo newton that it is designed to carry? What is the thickness and the size?)

  • Not a great idea as pointed out in the answers. However, you can use two on the ends of a piece of light rope as an ad-hoc meteor hammer or kusari-fundo with reasonable success (though you might get in trouble with law enforcement in some places for doing this). – Austin Hemmelgarn Aug 24 at 11:52
  • Are you intending to punch, or to use your fist as a downward hammer/stabbing motion? – Criggie Aug 24 at 12:49
  • @AustinHemmelgarn two carabiners on the ends of a rope are called quickdraws. A completely ordinary thing to carry. Well, law enforcement might ask you why did you have only a single quickdraw with you, without a harness or climbing shoes... – IMil Aug 24 at 13:48
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    @IMil Use as a weapon is why they may be particularly unhappy with you. If used as such, you might get hit by laws that prohibit possession or attempted use of a slungshot (technically similar, and people have been charged for this for home-made meteor hammers), which is a felony or misdemeanor in and of itself in some places here in the US (and possibly other jurisdictions). – Austin Hemmelgarn Aug 24 at 13:58
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As you suspect, using a carabiner like this will only damage your hand. Even brass knuckles are bad for your hand.

But if you want to find out for yourself, you can just try it on a punching bag. Go very light and then gradually increase the power. You probably won't get very far before you realize that the carabiner will just rotate in your hand, causing it to crash against the bones of your fingers upon impact. Instead of having a nice soft target you're striking your hand against, suddenly the metal carabiner becomes part of the punching bag you're punching. Imagine just winding up and punching a carabiner taped to a punching bag. That's basically what you're doing. It's not going to feel too good.

Some places will make custom brass knuckles specifically for your hand. Supposedly it means there will be less chance of slipping. But they still slip, and when they do, you will be in intense pain.

A lot of people think using a roll of quarters or something will make their punch much more powerful. It does, but it also makes the bones of your fingers much more likely to break upon impact on someone's head or jaw. It can also throw off your balance, as you're not used to punching with a weighted hand. And in some cases, it has caused people to have elbow and shoulder injuries, because the repetitive nature of the practice causes stress and damages tendons over time. Bad idea.

In my opinion, your best bet is to carry something to wrap around and protect your hands. Something like a punching bag glove. You can use a sock, too. Or you can cut out a section of denim from an old pair of jeans you're going to throw out, and just use that to wrap around your fist. It will allow your fist to be tighter and more solid. And it will help protect your hand's bones from breaking.

Everything else (brass knuckles, rolls of quarters, carabiners, kubotan key chains, etc.) just end up getting you hurt.

Hope that helps.

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    IIRC there were weapons used by the ancient Greeks and Romans called cestuses that were weights strapped to the back of the hand. en.wikipedia.org/wiki/Cestus – nick012000 Aug 24 at 7:45
  • @nick012000 They look very effective. Looks like it would tighten the fist and protect the bones. It also braces the wrist, preventing an accidental wrist sprain. They obviously knew what they were doing. – Steve Weigand Aug 24 at 13:52
  • What about a slap instead of a punch? – Evorlor Aug 24 at 16:43
  • Slaps don't have the kind of power behind them that comes from a good punch. You'd need to use this against a soft target on your opponent's body, maybe the floating ribs, temple, or nose. But that's limiting what you can strike. And you're limited to certain angles, rather than being face to face with your opponent. In a street fight, about the only way to use it as a slapping technique is like a sucker punch, from an off angle, preemptively. And then you could just throw it away and punch like normal. Kind of useless for normal self-defense. – Steve Weigand Aug 24 at 19:28
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Steve Weigand pretty much nailed the important bits about potentially damaging your own hand with something like this, but here's a little addition: in an actual street fight/self-defense situation, you REALLY, really, don't want to essentially tie your four, non-thumb fingers together. Not all bad guys are going to stand face to face with you and exchange punches like a boxing match. You'll most certainly want to forego the additional pain you can inflict with a small metal object wrapped around your fingers for the freedom to move your fingers individually, grab on to a fence, plant your hand on the ground for stability, grab someone's hair, grab on to someone's free arm while they're on top of you so they can't forearm smash your nose, etc.

Most street scuffles quickly devolve from a punching match, to a grappling, wrestling, choking, overall messy situation, and I'd rather be able to splay my fingers apart for various reasons than try to throw around a few grams worth of metal.

There's a reason why almost all MMA fighters use the same style of open-finger/"half-finger" glove:

MMA gloves or grappling gloves are small, open-fingered gloves used in mixed martial arts bouts. They usually have around 4–6 oz of padding and are designed to provide some protection to the person wearing the glove, but leave the fingers available for grappling maneuvers such as clinch fighting and submissions.

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It makes little sense to use a carabiner as illustrated in the video, as explained in existing answers.

It may occasionally make some sense to hold and use one in another way: placing it in your palm and wrapping the fingers and thumbs over it, such that the "fat end" projects slightly from the little-finger side of the palm. This will give you a steel striking surface, and the rest of the carabiner will rest against a large surface area of relatively fleshy palm and fingers, spreading the impact to your own hand and minimising the risk of damage. The grip would be largely similar to using the base of a torch or keyholder:

gripping a metal object for striking hammerfist style

(image copied to illustrate the kind of grip I describe above, turned up by a google image search from a website titled "Gentleman Warrior Self Defense System Volume 3, Kubotan" that I otherwise have no connection with or knowledge of).

(If you instead have the smaller end projecting, you'll get more localised pressure for the strike, but may have more localised pressure inside your own hand: you'll be supporting all the force of the strike along the far, fat edge of the carabiner where your thumb is, rather than all around the sides.)

Having that hard surface to strike with - hammerfist style - may help a weaker person inflict significant damage on a stronger person - evening things up a bit. A strike to sensitive targets such as the nose, teeth, temple, knee-cap or collar bone may be made more effective. I'd only suggest considering it (or more generally, grabbing anything similar to fight with) if you felt you otherwise weren't able to defend yourself, felt this might tip the balance in your favour (and not just make the other person angrier and more vindictive), and the fight itself was unavoidable.

Hammerfist style strikes are often easy to block though - your striking arm can be easily grabbed, so this will work best with the benefit of surprise, when dark, or when combined with a feint or combination attack. Once you strike and they're aware of the carabiner, if they're still a threat and you still can't run/escape, then you'd want to get as many follow up strikes in as fast as possible before they can adjust their defensive tactics. If your arm does get caught and they're much stronger, and you don't know "escapes" to twist your arm out of their hold, then instead of struggling uselessly - hit quickly with a still-free limb (palm, elbow, knee, foot) to another vulnerable target and hopefully they'll let go of the hand they've grabbed.

A skillfull but weaker person could also use the carabiner to inflict damage whilst blocking - striking shins or instep or the ulner or radius bones in the forearm, or even at the wrist. An untrained person has neglegible chance of lining up their hand with a particular point in the attacking limb and blocking effectively.

All that said, if you're planning to explore this, do follow Steve's advice and try hitting a punching bag or similar target that way - gently at first - so you can learn the best grip and whether it'll hurt your hand. Further, JJC8008 has a good point, and you should be prepared to pocket, drop or throw the carabiner at some stage during a fight if it becomes a net liability and you need to grab something / wrestle etc..

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  • I feel like most of your post is about a kubotan rather than a carabiner... – Macaco Branco Aug 27 at 13:36
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    @MacacoBranco: most of my post is applicable to anything you might grasp and use hammerfist-style, and I'm saying that's a more credible way to use a carabiner than the brass-knuckles suggestion in the video. A little of my post is about the specifics of carabiners: their shape making it easier to hold during impact if you put the larger end outwards (towards the target). If I were talking about kubotans, I may have suggested other targets, as they can extend further past the hand and penetrate more deeply into the target. I would agree that a kubotan would be more useful than a carabiner. – Tony D Aug 27 at 17:57

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