We can’t really think of anything useful you might want to do with the above ArmBlade, but that shouldn’t stop you from buying it. After all, if you only ever bought stuff that’s actually useful, you’d likely have a lot more money in your bank account. Measuring a healthy 17-3/8-inch long, the thing is made from one piece of hard-anodized black stainless steel. Along with the blade, you get all the other hardware needed to assemble it, including the grip and forearm strap. The best part, perhaps, is that you’ll have to pay all of $18 to own it. Which, all things considered, isn’t a whole bunch of money to spend on something not entirely useful.