Features: The Diamantine coated glass hole cutter features efficient centering drill design for high concentricity, ensuring precise positioning and rapid deeping drilling in materials like glass, marble, and tiles. Its electroplated Diamantine grit coating delivers 2x longer life than standard bits, with uniform cutting edges that effectively discharge debris for smooth operations during glass drilling projects. Ideal for both DIYer enthusiasts renovating bathrooms and professional contractors handling stone countertop installations requiring electric drill hole openers. Perfect for creating clean openings in shower doors, or kitchen backsplash installations where precise glass cutting tools are essential. Maintain optimal performances by applying water lubrication during use – this glass drilling tool's universally shank fits standard electric drills for versatile materials compatibility. Specifications: Component: Corundum plating Size:As Picture Shown Properties: Glass hole opener with center drill Package Includes: 1pcs Glass Drill Bit note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.