I purchased this set for drilling holes in some extremely hard porcelain tile. They worked exactly as needed. We ran them at a slower speed and kept them well lubricated with water while cutting/grinding. I can't speak to their long-term durability since we needed to make less than a dozen holes. I would suspect that with their small size and small cutting surface their useful life would be somewhat limited. Having said that, they were exactly what we needed since no other drill would make a dent in the tile. The nice size selection allows you create the exact hole size needed. Overall, I was very pleased with the price/performance ratio.
This was purchased from hobbytoolsupply here on Amazon and shipping was extremely quick. Get more detail about SE Diamond Hole Saw Set (6 PC) 5/32 "- 1/2".
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