The High Speed Steel Burs, Size 28 (7.2 mm) Heart 45° is a high-performance cutting tool engineered for jewelers who require superior control, power, and consistency for advanced stone setting and heavy-duty metal shaping. Constructed from premium High Speed Steel (HSS), this bur offers exceptional hardness, long-lasting sharp edges, and outstanding resistance to heat and wear — even under continuous professional use.

The 45° heart-shaped cutting profile is designed for creating precise, deep stone seats, controlled undercuts, and clean shaping in thicker or harder metal sections. With its large 7.2 mm (Size 28) diameter, this bur is ideal for bold metal removal, large stone settings, jewelry model making, and shaping applications requiring maximum stability and cutting strength.

Spiral-cut flutes ensure smoother cutting action, improved chip evacuation, and reduced heat buildup, allowing for a cleaner finish and greater tool longevity. The bur features a standard 3/32″ (2.35 mm) shank, ensuring full compatibility with flex shafts, micromotors, and professional rotary tools used in jewelry workshops.

This heavy-duty heart bur is the perfect tool for jewelers, model makers, and artisans who require precise control and powerful cutting performance for larger-scale or deeper setting work.

Key Benefits

• Professional Durability: High Speed Steel construction provides long-lasting sharpness and exceptional heat resistance.

• Precision 45° Heart Geometry: Ensures accurate shaping, deep stone seats, and controlled undercuts for secure settings.

• Smooth & Efficient Cutting: Spiral flutes reduce clogging, maintain cooler operation, and deliver consistent cutting performance.

• Large 7.2 mm Size: Ideal for heavy shaping, deep cuts, and larger stone setting tasks requiring more power and stability.

• 3/32″ Standard Shank: Compatible with all major jewelry rotary tools and flex-shaft systems.

• High-Level Performance: Produces clean contours, accurate shaping, and professional-quality finishing.