For drilling ceramic tiles, glass, marble, slate and porcelain tiles up to hardness grade 5. For u...For drilling ceramic tiles, glass, marble, slate and porcelain tiles up to hardness grade 5. For use with conventional power drills. Corrosion-resistant, chrome-plated carbon steel. Max speed 800rpm. Cuts ceramic, glass, marble, slate & porcelain. Diamond grit cutting edge. Fits all conventional power drills. Product Specification: Material - Secondary Construction Chrome, Shank Length Arbor - 24mm, Finish Polished, electroplated, Material - Abrasive Diamond dust, Product Weight 0.050kg, Abrasive Connection Electroplated, Depth of diamond dust - 3mm.