High Quality MaterialsThe diamond hole saw is made of high carbon steel with clean and soomth opening, no broken edges. Small incision resistance, stable drilling and won't break the border. Good DesignCenter pilot holes and side holes help to easily dispose of waste; Diamond drill bit has golden paints to prevent rusting, improve surface corrosion resistance. Wide ApplicationDiamond drill bits can be used to drill ceramic tile, marble, glass, granite, concrete and other hard materials. Will work with all electric drills and hammer drills. It is your ideal choice for DIY projects and home maintenance and repair. Please NoteWhen cutting hard materials, it is important to ensure that the bit stays cool to prevent damage to the material to be drilled and premature wear of the bit. Water is needed for lubrication when drilling, which can extend the life of the bit. Buy with ConfidenceWe offer a "TWO YEAR" warranty on the hole saw. If you have any questions, do not hesitate to contact us. We will try our best to solve it for you. (Please clamp the shaft in the right place and take the necessary protective measures in wood processing.) Product Diamond Hole Saw Drill Bit < p>Primarily used for drilling faucet mounting holes in stone countertops or plumbing lines in showers and vanities. Marble hollow drill bit Long lasting< /p> Made of high carbon steel, piercing quickly and precisely with long life. High carbon steel blade Sharp and smooth Small incision resistance, stably piercing for clean and smooth opening, not breaking the edge. Gold paint Durable Diamond coated hole saw has gold paints to prevent rusting. Features Material high-grade steel made of carbon Size 70 mm in diameter Package includes 1 x diamond hole saw bit < p>glass, ceramic tiles, porcelain tiles, marble, granite, reinforced concrete and other hard materials. Suitable machines Hand drill, Bench drill. Note Keep water or lubrication to cool the tool will prolong its life.