High Speed Steel Good balance of cost and durability. Maintains hardness (temper) at high speeds
Round Bur (Ball Bur)
Available in the widest range of diameters. Uses include: drilling, deburring holes, enlarging holes, carving recesses for sweat soldering, and refi ning bezels/seats for stone setting. Because of its shape it can be used at any angle and can get into tight areas easily.