The High Speed Steel Burs, Size 16 (4 mm) Heart 45° is a precision-engineered tool designed for professional jewelers who require accuracy, durability, and superior cutting performance in stone setting and fine metal shaping. Crafted from premium High Speed Steel (HSS), this bur ensures long-lasting sharpness, exceptional hardness, and reliable cutting action even during extended high-RPM use.

Featuring a 45° heart-shaped cutting profile, this bur is perfect for creating precise stone seats, controlled undercuts, and smooth contours for prong, bezel, and flush settings. The larger 4 mm (Size 16) diameter provides deeper cutting capability and efficient material removal, making it ideal for larger stone settings or more aggressive shaping while maintaining precise control.

Spiral-cut flutes enhance chip removal, reduce heat buildup, and prevent clogging, resulting in cleaner cuts and a professional finish. Its standard 3/32″ (2.35 mm) shank ensures compatibility with most flex shafts, micromotors, and rotary jewelry tools.

Designed for stone setters, engravers, and bench jewelers, this heart bur delivers reliable performance, smooth finishing, and professional-quality results for both soft and hard metals.

Key Benefits

• Exceptional Durability: Made from High Speed Steel for long-lasting sharpness and heat resistance.

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

• Smooth Cutting Action: Spiral flutes provide cleaner cuts, reduce debris, and maintain cooler operation.

• Optimal 4 mm Size: Size 16 offers deeper cuts and efficient material removal for larger stone settings.

• Standard 3/32″ Shank: Fits all professional jewelry rotary systems.

• Professional Results: Produces cleaner contours, secure stone seating, and minimal finishing work.