Sure, getting punched with brass knuckles will seriously mess you up, sometimes you need to deliver even more punishment than the trusty brass knuckles can deliver. That's why Blast Knuckles exist. They're essentially a pair of brass knuckles that also deliver a blast of 950,000 volts on contact. Yikes.
I'm no scientist, but I'm pretty sure that counts as a lethal weapon. Unless you're wearing a leather mask or something, but even then I don't think you could avoid getting pretty messed up. And now that you know this is out there and that your enemies may have it, you now need to get it as well so you're evenly matched. Luckily for you, it's only $50, making it a pretty affordable way to kill someone.