SB cylinder burs have a barrel-shaped cutting head with a flat end, and they have flutes on their sides and their end. They are used for deburring and finishing flat-bottomed slots and holes. Their cylindrical sides can also be used to remove material from contoured and flat surfaces. Cylinder burs are the most common bur shape. These carbide burs remove sharp edges, unwanted projections, and excess material from machined workpieces.