Diamond Hollow Drill Bits 4.0mm, 10pcs – Perfect for Stone, Glass & Ceramics

The Diamond Wire Hollow Core Drill Bit is a precision drilling tool engineered for creating clean, chip-free holes in hard and delicate materials including glass, stone, tile, porcelain, composites, resins, and even fragile objects such as eggshells.

Featuring a durable diamond-coated cutting edge, the bit grinds rather than shears the material, resulting in smooth, ready-to-use holes without additional finishing. The hollow core design preserves material and improves cutting efficiency.

Compatible with handheld rotary tools for small sizes (1–6mm) and drill presses for larger diameters (6mm+). For best performance, use with water or cutting oil, at low speed and with light pressure.

A top choice for lapidary work, jewelry making, tile installation, and crafts. Excellent for both professionals and hobbyists who need precision, versatility, and clean drilling in hard or brittle materials.

Applications

• Drilling chip-free holes in glass, stone, tile, porcelain, composites, resins
• Lapidary shaping, gemstone preparation, cabochon work
• Jewelry crafting and precision stone setting
• Tile installation, home repair, and artisan crafts
• Drilling fragile materials including eggshells and thin composites
• Suitable for Dremel-type rotary tools and drill-press systems

Key Features

• Diamond-coated tip for smooth, controlled grinding
• Hollow-core design for faster cutting and reduced material loss
• Produces clean, chip-free holes in brittle materials
• Compatible with handheld rotary tools and drill presses
• Works with water or cutting oil for cooling
• Best used at low speed and with light pressure
• Reliable for professional use and everyday hobby projects