JINGLING 6mm 1/4" Diamond Hole Saw Tile Drill Bit Masonry Tools for Stone Glass Pack of 10Pcs

The JINGLING 2Pcs 20mm 34" inch Diamond Hole Saws are made in China and great value for money. They are useful for drilling into wine bottles, porcelain pottery, cultured marble, thick tile, and quartzite. Users recommend watching how-to videos before use, and using a drill press or low-speed hammer drill. Keeping the surface wet is very important as it helps with the slow sanding process. The bits last for a long time and can cut through surfaces smoothly. Users recommend practicing on scraps before working on their final project. The bits are not without flaws, as some reviewers did have issues with the grit not holding up for very long or the bit breaking in the first use.