The Alpen 4.0mm Tungsten Carbide Glass Drill is ideal for professionals and DIY enthusiasts working with fragile materials. Designed for precision, it allows for smooth and accurate drilling in glass, porcelain, bottles, and ceramics. Rotary-only operation ensures damage-free results. Brand: Alpen Diameter: 4.0mm Material: Tungsten Carbide Range of Application: Glass, bottles, porcelain, ceramics Operation: Rotary only Features: Precision engineered, durable, suitable for delicate materials