Specification:Diameter: 25mm / 0.98"Shank Size: 8mm / 0.31"Working Depth: 35mm / 1.38" (approx.)Total Height: 65mm / 2.56"Features: Vacuum Brazed DiamondMaterial: Diamond, Carbon SteelPackage: 2 Pcs x Diamond Drill BitsDescription:1. Vacuum Brazed Technology: Vacuum Brazed technology provide much longer working life than electroplated technology.2. Ideal Application : For porcelain tile, granite, marble, stone, masonry, brick.3. Dry/Wet Use: Dry use, also can be used with water which can help to increase the performance.4. Sharp & Smooth Cut: Coated with diamond, the hole saw creates a precision and smooth cut, less chipping and minimizing any breakage.5. Drill Speed: Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.6. Use Advice: 45 degree angle drill positioning before using, and then drilled vertically.