Diamond Drill Bits for Glass & Jewelry – 5 Pack (0.8–2.5mm)

Diamond Coated Drill Bits – Precision Drilling for Glass, Jewelry & Stone

Take your craft and DIY projects to the next level with these diamond coated drill bits — engineered for clean, precise drilling through hard, brittle materials like glass, jade, amber, porcelain tile, vitrified brick, fiber glass, and stone. Each pack includes 5 pieces with a universal 2.35mm shank, making them compatible with most rotary tools and mini drills.

Whether you're a jewelry maker drilling precise holes through gemstones, a crafter working with glass bottles or jars, or a hobbyist tackling tile and stonework, these bits deliver consistent, chip-free results with minimal effort.

Key Features

• Diamond Coated Tip: Industrial-grade diamond coating for superior hardness and durability on tough materials
• Multiple Sizes Available: Head diameters from 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm to 2.5mm — choose the size you need
• Universal 2.35mm Shank: Fits most standard rotary tools, pendant drills, and flex-shaft machines
• Compact & Precise: 42mm total length with a 16mm working head — ideal for detailed, small-scale work
• Versatile Application: Glass, jade, amber, porcelain tile, vitrified surfaces, brick, fiber glass, stone, and more
• 5-Piece Pack: Great value — keep spares on hand for ongoing projects
• Silver Finish: Easy to identify and handle during intricate work

Specifications

What Can You Drill?

These bits are ideal for drilling through:

• Glass panels, bottles, and jars
• Jade, amber, and gemstones
• Porcelain and vitrified tile
• Fiber glass and brick
• Stone and rock specimens

Pro Tips for Best Results

• Use with water or a lubricant to keep the bit cool and extend its life during drilling
• Apply gentle, steady pressure — let the diamond coating do the work
• Start at a low RPM and gradually increase for cleaner entry points
• Use a guide or tape to keep the bit centered on smooth glass surfaces

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For guidance on safe tool use and workshop best practices, visit the U.S. Consumer Product Safety Commission – Power Tools Safety.

Learn more: Drill bit

Frequently Asked Questions

Q: What materials can these diamond coated drill bits be used on?

A: These diamond drill bits are designed for hard and brittle materials including glass, jade, amber, gemstones, porcelain tile, vitrified brick, fiber glass, and stone. They are not intended for use on wood or soft metals.

Q: Do I need a special rotary tool to use these drill bits?

A: No special tool is required. The 2.35mm shank is a standard size that fits most rotary tools, pendant drills, flex-shaft machines, and mini drills available on the market.

Q: Should I use water or coolant when drilling with these bits?

A: Yes, it is strongly recommended to use water or a suitable coolant while drilling. This keeps the bit and workpiece cool, reduces friction, extends the life of the diamond coating, and produces cleaner, chip-free holes.

Q: How many drill bits come in a pack, and what sizes are available?

A: Each pack contains 5 diamond coated drill bits. Available head diameter sizes include 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, and 2.5mm — select the size that best suits your project.