<b>Tile Hole Saw Diamond Drill Bits 6-50mm Glass Tile Hollow Core Extractor Remover Tools for Glass, Ceramics, Porcelain, Ceramic tile </b><br><br> <b>Description</b><br> 15 PCS a set diamond drill bits, hole saw core drill style bit. More than 20 years of experience in the production of glass drill bits, combining advanced technology and scientific achievements, performance.Fine workmanship and super wear-resistant, sharp<br><br> <b>Operation</b><br> Start the hole diagonally, make a round braid and then hold drill straight.Water is required for lubrication when drilling <br><br> <b>Tile Hole Saw15 Sizes</b><br> 6/ 8/ 10/ 12/ 14/ 16/ 18/ 20/ 22/ 25/ 26/ 28/ 30/ 40/ 50 mm <br><br> <b>SPEED KILLS</b><br> This tile hole saw are made of industrial grade carbon steel with nickel-plated coated body that resist corrosion.Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably <br><br> <b>WARNING</b><br> Not for use on Concrete or for depths beyond about 1/2"; Water is required for lubrication when drilling. <br>