The High Speed Steel Bur – Size 30 (8.0 mm) Inverted Cone is a robust and reliable tool, ideal for professional jewelers, metalworkers, and artisans who need a powerful yet precise shaping instrument. Made from high-speed steel (HSS), this bur resists heat and wear, offering long life and consistent performance even in intensive, high-RPM applications.

Thanks to its large 8 mm head, this inverted cone bur excels at heavy contouring, undercutting, smoothing out castings, and shaping larger surfaces. The inverted cone shape gives you excellent control over material removal while maintaining smooth, even finishes.

Equipped with a standard 3/32" shank, the bur is compatible with most rotary handpieces, flex shafts, and micromotors used in jewelry and craft work. If you’re refining wax models, working on metal surfaces, or smoothing wooden or plastic components, this bur brings strength and precision to your bench.

Built from high-speed steel, this Size 30 bur stays sharper for longer than vanadium burs, making it a cost-effective and high-performance tool. It’s perfect for shaping, cleaning, and finishing tasks where both power and finesse are required.

Key Benefits

• Durable HSS Construction — Long-lasting and heat-resistant for tough applications

• Large 8 mm Inverted Cone Head — Ideal for shaping, undercutting, and smoothing

• Powerful Material Removal — Efficient at removing metal or other materials quickly

• High Compatibility — Fits most rotary tools thanks to 3/32" shank

• Versatile Use — Suitable for both heavy-duty and fine-detail work

• Extended Tool Life — Sharpness retained over long usage