The 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 harm 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. (Please clamp the shaft in the right place and take the necessary protective measures in wood processing.)Product Diamond Hole Saw Drill BitPrimarily used for drilling faucet mounting holes in stone countertops or plumbing lines in showers and vanities.Marble hollow drill bitLong lastingMade of high carbon steel, piercing quickly and precisely with long life.High carbon steel bladeSharp and smoothSmall incision resistance, stably piercing for clean and smooth opening, not breaking the edge.Gold paint DurableDiamond coated hole saw has gold paints to prevent rusting.FeaturesMaterialhigh-grade steel made of carbonSize70 mm in diameterPackage includes1 x diamond hole saw bitglass, ceramic tiles, porcelain tiles, marble, granite, reinforced concrete and other hard materials.Suitable machinesHand drill, Bench drill.NoteKeep water or lubrication to cool the tool will prolong its life.