The High Speed Steel Burs, Size 18 (4.5 mm) Heart 45° is a precision-crafted rotary tool designed for professional jewelers who require durability, accuracy, and superior performance in stone setting and metal shaping. Constructed from premium High Speed Steel (HSS), this bur offers exceptional hardness, long-lasting sharpness, and reliable cutting efficiency even under continuous high-speed use.

Featuring a 45° heart-shaped cutting profile, this bur is perfect for creating precise stone seats, controlled undercuts, and smooth contours required for prong, bezel, and flush settings. The larger 4.5 mm (Size 18) diameter allows for deeper material removal and efficient shaping in medium-to-large jewelry designs while maintaining fine control.

Spiral-cut flutes ensure clean chip removal, reduce heat buildup, and prevent clogging for consistent, smooth cutting performance. The standard 3/32″ (2.35 mm) shank guarantees full compatibility with most flex shafts, micromotors, and rotary jewelry tools used in professional workshops.

Ideal for stone setters, bench jewelers, and engravers, this heart bur delivers precision, strength, and flawless finishes for professional-grade jewelry craftsmanship.

Key Benefits

• Superior Durability: Made from High Speed Steel for long-lasting performance and excellent heat resistance.

• Accurate 45° Heart Profile: Provides precise shaping for stone seats, undercuts, and metal contours.

• Smooth Cutting Action: Spiral flutes minimize clogging and ensure clean, consistent cuts.

• Optimal 4.5 mm Size: Size 18 enables deeper cuts and greater efficiency for larger stones or designs.

• Standard 3/32″ Shank: Fully compatible with professional rotary tools and flex shafts.

• Professional Results: Produces clean contours, secure stone seating, and reduced finishing time.