Niqua® 79 Tool Steel Burs Egg

Shape convex and concave curvatures, blend complex sculptural contours, and mill broad stone seating cavities with chatter-free rotary control. Manufactured to strict Swiss-Made precision standards for NIQUA, the NIQUA® SUPER Q® Egg-Shaped Bur "79" (Eifräser / Ovoid Bur) is an industrial-grade rotary shaping cutter engineered for professional goldsmiths, gemstone setters, and fine jewelry model makers.

Featuring an ovoid profile that tapers gracefully from a rounded broad base toward a narrower domed apex, the Series 79 bur bridges the gap between round (spherical) burs and elongated flame cutters. This compound egg geometry gives artisans multi-radius cutting capability: the tighter apex radius accesses tighter transitional corners and deep setting hollows, while the broad, sweeping side radius smooths and levels compound curvatures without digging harsh grooves. Forged from premium hardened tool steel, each bur delivers clean chip evacuation and dependable edge retention in soft, ductile alloys including yellow gold, sterling silver, copper, brass, and related non-ferrous metals. Fitted with an industry-standard 2.35 mm (3/32") shank, these large egg burs mount directly into jeweler flexible shaft handpieces, heavy-duty bench micromotors, and quick-change chuck systems. Available in substantial finishing diameters of 6.00 mm and 8.00 mm (Art.-No. 03 247 060 and 03 247 080), each size is packaged in a bench storage box containing 6 pieces.

Why Choose NIQUA® SUPER Q® 79 Egg-Shaped Burs

• Distinctive Ovoid (Egg-Shaped) Geometry: Blends a broad lower belly with a tapered domed nose, allowing artisans to transition seamlessly between narrow recesses and broad contour sweeps with one tool.

• Facet-Free Surface Smoothing: The progressive curvature prevents the creation of flat spots and harsh transitional ridges, ensuring smooth, flowing contours on cast mountings.

• Deep Swarf Evacuation Flutes: Precision-milled fluting quickly lifts and expels ductile shavings, preventing chip packing, surface galling, and tool loading in soft precious metals.

• Low-Vibration Concentric Operation: Precision-ground Swiss tool steel core minimizes radial runout, ensuring steady handpiece tracking and smooth cuts.

• Hardened Swiss-Quality Tool Steel: Provides wear resistance, edge sharpness, and extended service life across continuous workshop use.

• Universal 2.35 mm (3/32") Shank: Provides seamless compatibility across standard flexible shaft systems, quick-change handpieces, and laboratory micromotors without collet adapters.