Review on Sunjoyco Diamond Cutting Porcelain 6Mm 50Mm by David Banks

. The 8mm bits were what I wanted but thought I would get the whole set. I've used carbide tipped bits on this tile before and while it was difficult and I ruined the bits, I got over it in time. I started drilling the first hole and immediately encountered a problem. First, the little pieces want to go everywhere. After I started it, the problem kept coming back. The diamond abrasive came off almost immediately on the first hit. I thought it was a bad beat and played another one with the same result. I tried the drill on the slowest setting, with water to cool the cut, and still nothing. I used 4 drill bits and barely drilled 1/8 inch into the tile. They may work well on a much softer product like marble and maybe even ceramic tile and glass, but they should NOT be advertised on porcelain.