A thicken diamond coating on the tops offers superior cutting strength for maximum drilling outcomesSHARP & SMOOTH CUT The diamond creates a high precision, smooth cut with no broken edges. Excellent for making clean and accurate holeSATISFIED SIZE Cutting hole diameter : 8mm / 0.3 inch, length: 6cm /2.3inch. Super drill bits you can drill where you want to drill your hole and use it as a "guide" to start the holeOPERATION Start drill at 45 to surface and align to 90 as hole forms. Reduced drill speeds, low drill pressure,and water is required to down the drill when using them, extend drill bit life considerablyAPPLICATION Hole saws perfect for drilling glass, tile, porcelain tile, ceramic tile, brick, blocks jars, slate mable, granite light stoneGood Performance:Diamond dust coating offers superior performance and cutting strength. Diamond coating maximizes performance and retains a sharper cutting edge than traditional carbide or bimetal hole sawsNo tremor phenomenon, small incision resistance and fast hole speed, easy chip evacuation, ensuring you a nice experince when using diamond .Wide Application of The Tile : set for wet cutting tiles, glass, fish tanks, marble, granite, ceramic, porcelain, bottles, quartz sinks.50 diamond coated core hole saws for kitchen, bathroom, shower, faucetsColor: SilverMaterial: DiamondHow to Use Tile Drill Correctly:Use pen to mark start of hole, and keep wet with water or coolant.Angle drill 45 degrees to start hole, and being drilling at low speeds. Angle drill to vertical position once the hole has started.Minimum pressure. Slow speed down for exit hole or drill from the other side to prevent breakthrough.Note:Electroplated diamond coating will wear off if the tool gets too hot. Never let your drill bit run dry. Please keep adding water when the diamond drill bits are working on the glass or ceramics.Package include:50 x Diamond Coated Drill BitOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.