Bearing, or hart, burs are primarily used by jewelers and hobbyists. The top of the bur has a cone shape with an angle underneath. There are three profile angles to choose from: 45 degrees, 70 degrees, and 90 degrees. They are made from steel or carbide and are available in a wide range of diameters.
Bearing burs are commonly used for stone setting. They are useful for cutting seats in prongs and for making channel and flush settings. Bearing bur sides can also be used to score lines.
Following are links to different types of bearing shaped burs:
▶ Bearing Shaped Busch Steel Burs
▶ Bearing Shaped Busch Carbide Burs