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HD Hart 90 degree in mm (Shank 2.34mm). Use drop down menu to select size and quantity 0.90mm up to 2.30mm.
This is the most commonly used bur for stone setting. Its shape makes it perfect for cutting seats in prongs and for channel and flush settings. Hart burs can also be used for scoring lines or as an alternative to flywheels for bright-cutting.
Names for this shape: Hart Bur, Bearing Cutter, Undercutting bur, HD bur