6-Piece Round Ball Burr Set 4–12mm | Abrasive Mounted Points

6-Piece Round Ball Burr Drill Bit Kit – 4mm to 12mm Abrasive Mounted Points

Take your grinding, sculpting, and carving work to the next level with this versatile 6-piece round ball burr set. Featuring coarse emery-coated heads in six graduated sizes (4, 5, 6, 8, 10, and 12mm), these mounted points tackle a wide range of materials — from ceramics and glass to gemstones, carbide alloys, and metals — with ease and precision.

Why Choose This Burr Kit?

• Six Sizes in One Kit: Head diameters of 4 / 5 / 6 / 8 / 10 / 12mm cover everything from fine detailing to aggressive material removal.
• Universal 3mm Shank: Fits standard rotary tools, hanging grinders, and hand electric drills — no adapters needed for most setups.
• Durable Emery Coating: Coarse-grit abrasive bonded to a solid metal shank delivers long-lasting cutting performance on hard materials.
• Round Ball Shape: The spherical head profile is ideal for internal grinding, curved surface dressing, contouring, and sculptural carving work.
• Multi-Material Use: Suitable for ceramics, glass, gemstones, carbide, alloys, and other hard abrasive materials.
• Compact Length: 33–40mm overall length keeps the bit stable and easy to control during detailed work.

Specifications

Compatible Tools

These burr bits are designed to be installed in:

• Electronic / rotary grinders
• Hanging (flexible shaft) grinders
• Hand electric drills

Package Contents

• 6 × Round Ball Burr Grinding Needle Heads (one of each size: 4, 5, 6, 8, 10, 12mm)

Made in Mainland China.

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For general workshop and tool safety best practices, refer to the OSHA Abrasive Wheel Machinery Safety Guidelines.

Learn more: Oscillating multi-tool

Frequently Asked Questions

Q: What materials can these round ball burr bits grind and carve?

A: These emery-coated mounted point burrs are suitable for grinding, sculpting, dressing, and internal carving on ceramics, glass, gemstones, carbide, metal alloys, and other similarly hard abrasive materials.

Q: What shank size do these burr bits use, and will they fit my rotary tool?

A: All six bits feature a standard 3mm shank diameter, which is compatible with most rotary tools, hanging grinders, and hand electric drills. Please verify your tool's collet or chuck size before purchasing.

Q: What is the difference between the six sizes included in the kit?

A: The kit includes head diameters of 4mm, 5mm, 6mm, 8mm, 10mm, and 12mm. Smaller sizes (4–6mm) are best for fine detailing and tight internal curves, while larger sizes (8–12mm) are suited for broader surface grinding and faster material removal.

Q: Are these burr bits reusable, and how long do they last?

A: Yes, these are reusable abrasive tools. Longevity depends on the hardness of the material being worked and the speed and pressure applied. Using appropriate rotary speeds and avoiding excessive force will extend the working life of each burr.