The High Speed Steel Burs, Size 12 (3.1 mm) Heart 45° is a high-precision cutting tool engineered for professional jewelers who demand accuracy, durability, and superior performance in stone setting and fine metal shaping. Made from premium High Speed Steel (HSS), this bur provides exceptional hardness, long-lasting sharpness, and stable cutting capability during extended high-speed use.

The 45° heart-shaped cutting profile is specifically designed for creating precise stone seats, controlled undercuts, and smooth contours essential for prong, bezel, and flush settings. The larger 3.1 mm (Size 12) diameter offers enhanced cutting depth and efficiency, making it ideal for medium to large stone settings, secure seat formation, and more aggressive shaping without sacrificing control.

Its spiral-cut flutes deliver superior chip removal, reduced heat buildup, and cleaner cutting action. This prevents clogging and ensures consistent, smooth performance. The tool features the standard 3/32″ (2.35 mm) shank, ensuring full compatibility with all flex-shafts, micromotors, and rotary systems used by professional jewelers.

Designed for stone setters, engravers, and bench professionals, this heart bur provides the accuracy, strength, and finishing quality required for high-level craftsmanship.

Key Benefits

• High Durability: Manufactured from High Speed Steel for long tool life, superior hardness, and excellent heat resistance.

• Precision 45° Heart Profile: Ideal for accurate stone seats, undercuts, and detailed jewelry shaping.

• Smooth Cutting Performance: Spiral flutes minimize clogging, remove debris efficiently, and maintain cooler operation.

• Optimal 3.1 mm Size: Size 12 delivers deeper cuts and greater control for medium-to-large stone settings.

• Standard 3/32″ Shank: Fully compatible with all major jeweler’s rotary tools.

• Professional Results: Ensures clean contours, accurate seat formation, and reduced finishing time.