CLEAN AND SMOOTH CUT Diamond hole saw creates a precise and smooth cut without broken edges. Excellent for making a clean and precise hole SATISFIED SIZE Cutting hole diameter: 6 mm / 0.23 inches, length: 5 cm / 2.5 inches. Great drill bits that you can drill where you want to drill your hole and use it as a "guide" to start the hole OPERATION Start drilling at 45° to the and align it to 90° as the hole forms. Reduced drilling speeds, low drilling pressure and are required to cool the drill bit during use, greatly extending the life of the drill bit APPLICATION Perfect hole saws for drilling glass, tile, porcelain tile, ceramic tile, brick, jars, slate, stone Material: Diamond + Metal;Good Performance:Diamond dust coating provides superior cutting performance and resistance. Diamond coating maximizes performance and maintains a sharper cutting edge than traditional carbide or bi-metal saws No wobble phenomenon, small incision resistance and hole speed, easy chip evacuation, you a