These cutting inserts are of excellent quality and suit my project very well. My wife bought some glass bowls to plant flowers in and needed drainage holes in the bottom. I placed the pots upside down on cardboard and drilled through them from the outside with a cordless drill. Using a 1/4-inch drill bit and medium speed, he drilled holes in just a few seconds at a time. I used some water to cool the bit but it cut so easily I guess it wasn't really necessary.
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