Review on Durable 20Pcs Diamond Grinding Bits: 12mm Cylinder Head with 1/8 Shank - 45mm Long Diamond Coated Burr Mounted Point by Paul Evangelista

I'm creating a mosaic in the first image about 33 inches in diameter. ) is shown in the second figure. They worked absolutely perfectly. I used them in a dremel with one of the bases to keep the drill bit at the correct height from the tile and adjusted the depth. First a shallow cut, then a deeper cut, then a full cut. I kept the cut damp with a cloth dipped in water. Grind, grind, grind, wet, grind, grind, grind, wet. you have the idea I used two of the 20 bits included in the kit to sand the inside of the "S". and to smooth the outer curves. I could probably keep using the first one, but I replaced it just in case. I have found that diamond drills work much better when even the smallest drop of water remains on the workpiece. They work great and at a great price.