Hello all. I am making a "grave stone" for a pet that has past and I have been commissioned to create a grave stone for the garden. I will be creating a pocket to place a clay paw print in (about 2 1/2" in diameter) and putting a name and dates on it. Nothing real fancy. I have a lot of old 1/4" end mill CNC bits used for wood projects, but not sure if they will cut it. The pocket only needs to be about 1/2" deep and the letters 1/8" at the most. Will my old bits do the job or should I get a different bit for this? Thanks in advance for the help. Stacey