& 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 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