Tell us about yourself!
If the penny is valuable (and some really are- check a coin book for condition and value) then you've totally ruined it. This goes for any coin- copper, silver, gold. Check for condition/value first.
Max- I didn't know. I apologize for being so presumptuous.
Nice- I like molded leather projects- it shows creativity,- great job!!!
I'm sorry, (& I don't mean to be disrespectful,) but why would you not just go to the hardware store (or a big box store) & buy a container of them for just a few dollars? It's not as though a phillips bit costs $15.00 each [AND, at the hardware/big box store, you can get them with standard hardness up to specially hardened bits, including some for use in impact drivers].