I use it for keep my electronic parts.You can make in it a small circuit board or something.
it's the final result
Step 1: What You Must to Have.
-Utility knife (or other sharp tool)
-Setsquare (I don't know if this word is good)
Step 2: Cutting Holder.
I cut 3 inches of cable holde rand so my box will have a 4.5 centimeter.
Step 3: Sidewall
Step 4: Bending the Sidewall.
And do it on the other side.