SHARP SMOOTH CUT The diamond hole saw creates a high precision, smooth cut with no broken edges. Excellent for making clean and accurate hole SATISFIED SIZE Cutting hole diameter : 6mm / 0.23 inch, length: 5cm /2.5inch. Super drill bits you can drill where you want to drill your hole and use it as a guide to start the hole OPERATION Start drill at 45 to surface and align to 90 as hole forms. Reduced drill speeds, low drill pressure,and water is required to cool down the drill when using them, extend drill bit life considerably APPLICATION Hole saws perfect for drilling glass, tile, porcelain tile, ceramic tile, brick, blocks jars, mable, light stone Material: Diamond + Metal Good Performance: Diamond dust coating offers superior performance and cutting strength. Diamond coating maximizes performance and retains a than traditional carbide or bimetal hole saws No tremor phenomenon, small incision resistance and fast hole speed, easy chip evacuation, ensuring you a nice experince when using diamond hole saw. Wide Application of The Tile Hole Saw: Hole saw set for wet cutting tiles, glass, fish tanks, marble, , ceramic, porcelain, bottles, quartz sinks. 50 diamond coated core hole saws for kitchen, bathroom, shower, faucets : Color: Silver How to Use Tile Hole Saw 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 Contents: 50 x Diamond Drill Bit Only 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.