BGTEC Diamond Dry Drill Bit Set, 5 Pieces, 6/6/8/10/12 mm, Hole Saws for Granite, Marble, Masonry, Concrete, Tiles/Ceramic, Glass, Hard Plastic, Vacuu

5 pieces (6 mm, 6 mm, 8 mm, 10 mm, 12 mm). Multifunctional drill holes for granite and marble, masonry, concrete, tiles/ceramic, glass, hard plastic, universal drilling. Wash inside for cooling, our diamond tip drills have integrated washing cores for cooling and lubrication. Specially developed with hole and groove on the side of the drill for removing stone chips. Dry drilling without water. Use water when drilling longer. The vacuum brazed diamond technology offers a very high efficiency, cut