The High Speed Steel Burs, Size 4 (1.5 mm) Heart 45° is a precision-engineered tool designed for jewelers who require exceptional control and accuracy in fine stone setting and delicate metal detailing. Manufactured from premium High Speed Steel (HSS), this bur delivers superior hardness, long-lasting sharpness, and dependable cutting performance during continuous high-speed operation.

With a 45° heart-shaped cutting profile, this bur is ideal for creating refined stone seats, precise undercuts, and smooth contours essential for prong, bezel, micro-setting, and intricate jewelry designs. The compact 1.5 mm (Size 4) diameter makes it perfect for small stones, fine detailing, and precision cuts where maximum control is required.

Spiral-cut flutes ensure optimal debris removal, cooler operation, and clean, consistent cutting. This prevents clogging and maintains sharp performance throughout the workflow. The standard 3/32″ (2.35 mm) shank is compatible with all professional flex shafts, micromotors, and rotary jewelry tools, offering seamless integration into any jeweler’s bench setup.

Ideal for micro-stone setters, bench jewelers, engravers, and designers, this heart bur is engineered to deliver unmatched precision, cleaner seat formation, and high-quality finishing across a wide variety of jewelry applications.

Key Benefits

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

• Precision 45° Heart Profile: Perfect for micro-stone settings, detailed undercuts, and delicate shaping.

• Clean Cutting Action: Spiral-cut flutes reduce clogging and enhance chip removal for smooth, consistent cuts.

• Compact 1.5 mm Size: Size 4 offers exceptional control for the smallest stones and intricate detail work.

• Standard 3/32″ Shank: Fits all major jeweler’s rotary systems for professional use.

• Superior Finish Quality: Produces clean contours, accurate seats, and reduced finishing time.