Step 1: Materials
1) A drill
2) A bench sander
3) Some 150 grit sandpaper (or higher for a more polished look)
4) A steel rod of your choice (I used 3/8 inch but you can use 1/4inch or any other you prefer) found at the hardware store
5) A ruler (or any other accurate measuring device)
6) Parachute cord (optional).
Step 2: Measuring and Cutting
This is entirely up to you, however, some sizes like 50 ft may be impractical... By general rule of thumb: 8 inches if you have small hands, 10 inches if you have average hands, and 12 inches if you have really big hands.
To cut, simply measure, mark, and cut with a dremel tool. If you don't have a dremel tool then a cut off wheel, or a fine toothed saw will do the trick.
Step 3: Cleaning It Up
Step 4: Get to the Point!
Side note: Please be sure not to touch the rod until you have run water over it or let it cool down a while because it is very hot.
Another side note: this does not need to be heat treated to harden the point, after all I've put my Bo shuriken through, I've not had any problems with the point. If you make yours out of a different material then what I made mine from, you may experience a weaker point and have to heat treat the tip.
Step 5: Finished?
But wait... A question mark? Is there more?
Yes, if you want to go a bit further, you can add a nice parachute cord handle. Gut the cord and tie a long two bight turks head knot near the dull end for better grip. Be sure to shrink the cord after you have tied the knot to prevent if from sliding off.
Note: my Bo shuriken turned out to be closer to 9 and 7/8 inches, or to be more precise, 24.95 cm. ( pun not intended)
Step 6: Wait! How Do I Throw?
To hold it look at the picture above, and when throwing you release with the thumb.
Step 7: Safety
Store your Bo Shuriken in a safe place where no children can get ahold of them and/ or play with them.
In the case that your Bo Shuriken may ricochet or bounce back I recemend you not try to catch it.
* unless your being attacked by a life threatening person or pet.
I hope you all have enjoyed my instructable, let me know your thoughts and opinions in comments.