Maintain optimal by applying water lubrication during use – this glass drilling tool ' s universally shank fits standard electric drills for versatile materials compatibility 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 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 Perfect for creating clean openings in shower doors, or kitchen backsplash installations where precise glass cutting tools are essential, Manufacturer: JDNH