The Alpen 5.0mm Tungsten Carbide Glass Drill provides excellent performance when drilling through fragile surfaces. Built with premium tungsten carbide, it ensures precision drilling in glass, bottles, porcelain, and ceramics. For best results, use in rotary-only mode. Brand: Alpen Diameter: 5.0mm Material: Tungsten Carbide Range of Application: Glass, bottles, porcelain, ceramics Operation: Rotary only Features: Precision engineered, durable, suitable for delicate materials