Ninja Caltrops




So, you wanna be a ninja? Well heres something you might need.

"Caltrops" - A caltrop (calthrop, jack rock, star nail or crow's foot) is a weapon made up of two (or more) sharp nails or spines arranged in such a manner that one of them always points upward from a stable base (for example, a tetrahedron). Caltrops serve to slow down the advance of horses, war elephants, and human troops. It was said to be particularly effective against the soft feet of camels.[1] In more modern times, caltrops are used against wheeled vehicles with pneumatic tires. In Japan such devices were known as makibishi.

Gotta Get them camels!

Step 1: Materials

Materials: Scissors and a peice of sheet metal about 1" X 2".
Actually the size doesn't matter but I like this size.

Or if you are using thicker metal use tin snips

Step 2: Cutting 1

Here is where the scissors are needed.

Cut 2 lines length wize from each end about 1/3 of the way (see picture)

Step 3: Cutting 2


Cut from the... just look at the picture

You want the final out come to look like a squished hour glass

Step 4: Bend

Here might be the hard or easy part. If you have thick sheet metal then find something curved and hammer it into shape.

If you got thin metal from a pop can or what have you then you can just bend it with your fingers.

Postition the metal so the hour


Now! Throw it on the ground and it will always land with a point up.

If you made it with thin metal it will probly only hurt people with no shoes but if its thick you'll be ripping TROUGH CAMEL FEET!



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    98 Discussions


    6 years ago on Step 3

    it would be fun thinking of diffrent shaps, cat, dog, space invader. I had some more ideas.


    7 years ago on Introduction

    By definition, these work as caltrops, but I'm sure the actual Japanese terminology for them are tetsubishi.

    No matter what you call them, toss some of these on the ground while some bare footed Ethiopian children are running after you, and you have a 90% chance of losing them.

    You could also build a pit large enough to fall in, and place a bucket full of caltrops at the bottom, and cover the top of your trap with a flimsy wire mesh screen and cover it with leaves.


    10 years ago on Step 5

    FANTASTIC! DIE CAMEL FEET MWAHAHAHA saddly when i fist made these i droped one (unknowingly) on the floor of my living room whilst walking about the room you'll never guess what found its way into my foot....OUCHIE! but all in all fantastic instructable and by the way i made mine very small out of super thrick metals so they hurt through shoes and i cary them in a pvc tube with a cork for being a ninja! THANKS for the instructable!

    15 replies

    Reply 10 years ago on Introduction

    Nooo!!! How dare you try get rid of camel feet! Fool! You will never defeat the Kryptonic Camel!!! (Me.)... hehehe, I killed superman, can you kill superman?


    Kill dog feet!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! MWAHAHAHAHAHAHAHHAHAHAHA!!!!!!!!!!!!!