Busch Fig 446AU Carbide 70 Degree Hart Burs on 3/32" Shanks-Set of 15 .90mm-2.30mm

The Busch Fig 446AU Carbide 70 Degree Hart Burs are precision-engineered tools designed specifically for cutting seats in prongs. This complete kit includes 15 burs in a plastic storage box, covering sizes from 0.90mm through 2.30mm in 0.10mm increments — giving jewelers and stone setters the full range needed for consistent, accurate prong seat work.

Carbide burs are the longest-lasting burs available, outlasting both tungsten vanadium and high-speed steel burs. They perform exceptionally on the toughest metals — including platinum, titanium, and steel — while also delivering dramatically extended service life on standard gold alloys. Their advanced blade geometry, typically found only on steel tools, is achieved through state-of-the-art manufacturing in Germany.

Features

• 70-degree hart bur geometry engineered for precise prong seat cutting
• Carbide construction outlasts tungsten vanadium and high-speed steel burs
• Suitable for platinum, titanium, steel, and all standard gold alloys
• Advanced blade geometry normally reserved for steel tooling
• Manufactured in Germany using state-of-the-art production techniques
• Complete set of 15 burs stored in a plastic box for organized access
• Also available individually by the piece

Specifications

What's Included

• BAU118.609 — 0.90mm
• BAU118.610 — 1.00mm
• BAU118.611 — 1.10mm
• BAU118.612 — 1.20mm
• BAU118.613 — 1.30mm
• BAU118.614 — 1.40mm
• BAU118.615 — 1.50mm
• BAU118.616 — 1.60mm
• BAU118.617 — 1.70mm
• BAU118.618 — 1.80mm
• BAU118.619 — 1.90mm
• BAU118.620 — 2.00mm
• BAU118.621 — 2.10mm
• BAU118.622 — 2.20mm
• BAU118.623 — 2.30mm

Notes

Related Busch carbide bur sets are also available: Fig 414AU 90-degree hart burs (part number BAU118.500) and Fig 413AU traditional setting burs (part number BAU118.835). All individual sizes from this kit are also sold separately.