The High Speed Steel Burs, Size 26 (6.3 mm) Heart 45° is a heavy-duty, precision-engineered tool designed for professional jewelers who work with larger stone seats, deeper cuts, and advanced metal shaping applications. Manufactured from premium High Speed Steel (HSS), this bur delivers exceptional durability, extended edge retention, and superior cutting power during long, high-speed use.

The 45° heart-shaped cutting profile is ideal for shaping large stone seats, carving deep undercuts, refining contours, and preparing secure settings for medium to large gemstones. With its larger 6.3 mm (Size 26) diameter, this bur offers significantly increased cutting depth and material removal efficiency while maintaining excellent control.

Its spiral-cut flutes ensure smoother cutting, reduced heat buildup, and efficient chip removal, resulting in cleaner surfaces and minimized clogging. Designed with the standard 3/32″ (2.35 mm) shank, it is compatible with all major jewelry rotary tools including flex shafts and micromotors.

Ideal for professional bench jewelers, engravers, and stone setters, this heart bur delivers exceptional precision, cleaner finishes, and reliable performance, even on harder metals such as platinum, gold, and stainless alloys.

Key Benefits

• High Durability: High Speed Steel construction ensures superior hardness, heat resistance, and long tool life.

• 45° Precision Heart Profile: Perfect for accurate shaping of deep stone seats, undercuts, and wide contours.

• Smooth Cutting Efficiency: Spiral-cut flutes remove debris cleanly and reduce heat for consistent performance.

• Large 6.3 mm Size: Ideal for deeper cuts and medium-to-large stone settings requiring greater material removal.

• Universal 3/32″ Shank: Fully compatible with all major jeweler’s rotary tools.

• Professional Finish: Produces clean, accurate contours with minimal correction required.