Diamond Milling Bit for Enlarging and Shaping Hole, ...

I almost replaced my bathroom porcelain sink because the faucet hole is too small to accommodate my new faucet. Then, I found a post that suggests using a diamond coated bit to make a hole bigger. I went to Home Depot and Lowes, and they do not carry anything that is diamond coated.

I bought this with next day delivery. It mounted onto my 4.5" angle grinder and worked like a champ. I stopped 2 or 3 times during grinding just to check the progress. Overall, it took very minimal grinding (maybe 30 second all together) to grind away 1/4" of thickness. Some porcelain around the hole is chipped, like 1/8" or smaller chips. I don't know if chipping is due to my grinding technique or it's inevitable from grinding. Regardless, the new faucet's base plate will cover it up anyway.

I am very glad that I spent $25 and saved $250 from needing to buy a new sink.

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