The High Speed Steel Burs, Size 3 (1.35 mm) Heart 45° is a precision micro-cutting tool engineered for jewelers who require exceptional control in fine stone setting and delicate metal shaping. Made from premium High Speed Steel (HSS), this bur provides outstanding durability, long-lasting edge retention, and consistent performance even under continuous high-speed use.

The 45° heart-shaped profile is specially crafted for detailed stone seats, micro undercutting, and ultra-fine shaping work. With its small 1.35 mm (Size 3) diameter, this bur is ideal for precision tasks such as setting small gemstones, micro pavé work, clean undercut reliefs, and refining intricate jewelry designs. It offers remarkable accuracy while minimizing the risk of over-cutting or damaging delicate areas.

A spiral-fluted cutting design ensures smooth chip flow, reduced heat generation, and cleaner metal removal, helping jewelers maintain control during close-up detailing. The bur includes a standard 3/32″ (2.35 mm) shank, ensuring compatibility with all professional flex shafts, micromotors, and rotary jewelry tools.

This heart bur is widely used by professional bench jewelers, stone setters, engravers, and designers who need a reliable tool for micro-detailing and precise gemstone seating.

Key Benefits

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

• Precision Heart Profile: 45° design enables accurate stone seats, micro undercuts, and refined detailing.

• Smooth Cutting Action: Spiral flutes prevent clogging and ensure clean, consistent material removal.

• Ideal 1.35 mm Size: Perfect for micro stone-setting, pavé work, and fine jewelry detailing.

• Standard 3/32″ Shank: Compatible with all major jeweler’s rotary systems.

• Professional Finish: Produces clean, secure stone seats with minimal finishing needed.