Niqua® 24 Tool Steel Burs Inverted Cone

Level flat-bottom seats, undercut stone prongs, and machine crisp inner contours with high rotational stability. Manufactured in Germany by NIQUA to European toolmaking standards, the NIQUA® SUPER Q® Inverted Cone Bur "24" is a specialized milling cutter for fine jewelry manufacturing, micro-setting, and contour detailing.

Featuring a reverse-tapered cone head with end-cutting teeth and fluted conical side facets, the Series 24 bur allows jewelers to create sharp 90-degree internal corners, flatten recessed galleries, and cut bearing notches underneath prongs. Forged from premium hardened tool steel, each bur delivers clean chip clearance in ductile, clog-prone precious metals including yellow gold, sterling silver, copper, and brass alloys. Fitted with a standard 2.35 mm (3/32") shank, these burs integrate with flex shaft systems, quick-change handpieces, and micro-motors. Available in calibrated diameters from 0.60 mm to 2.90 mm (Item Codes: 03 201 006 to 03 201 029), each size is packaged in a bench-ready storage box of 6 pieces.

Why Choose NIQUA® SUPER Q® Inverted Cone Burs "24"

Reverse-Tapered Inverted Cone Geometry: Allows precise access under prongs, inside bezel walls, and into tight channel corners where cylindrical or ball burs cannot reach.
Simultaneous End and Side Cutting: Precision-ground face and fluted side edges flatten recesses while truing vertical walls in a single motion.
Clog-Resistant Chip Clearance: Optimized flute gullets quickly evacuate shavings, preventing metal galling and tooth buildup in soft gold and silver alloys.
Vibration-Free Concentric Operation: Machine-ground tool steel shanks reduce radial runout, preventing chatter marks and protecting delicate stone seats under microscope inspection.
Hardened German Tool Steel: Delivers edge retention and wear resistance during daily repetitive bench production.
Universal 2.35 mm (3/32") Shank: Drops into standard bench micromotors and flexible shaft handpieces without adapters.

Size Selection

Diameter (mm)	Item Code
0.60 mm	03 201 006
0.70 mm	03 201 007
0.80 mm	03 201 008
0.90 mm	03 201 009
1.10 mm	03 201 010
1.20 mm	03 201 012
1.40 mm	03 201 014
1.60 mm	03 201 016
1.80 mm	03 201 018
2.10 mm	03 201 021
2.30 mm	03 201 023
2.50 mm	03 201 025
2.70 mm	03 201 027
2.90 mm	03 201 029

Gemstone & Diamond Setters: Cutting precise bearing notches inside prongs, squaring channel-setting grooves, and creating flat-bottom seats for baguette and square-cut stones.

Fine Goldsmiths & Silversmiths: Truing inner corners, flattening recessed solder cavities, and cleaning bezel interiors.

Hand Engravers & Model Makers: Defining sharp shadow lines, cleaning miniature relief work, and detailing wax models.

Jewelry Repair Workshops: Reshaping collapsed prong bearings, removing excess solder from setting corners, and truing damaged mounting plates.

Free Global Shipping
We process orders within 1-3 business days. Estimated standard international delivery is 6-12 business days.

14-Day Returns
We have a 14-day return policy. Items must be unused, with all original accessories, and in original packaging.

For full details, please refer to our Shipping and Refund policies at the bottom of the page.