B202SD410 - Double Cut Carbide Burs Ball Shape 1/4? Shank Ball Shape Carbide Burs The chisel tooth pattern not only minimises tool chatter but reduces the chip to a granular shape, in most materials. Al Cut for rapid material removal of soft materials such as: Aluminium, Brass, Copper, Plastics that would normally load other cuts Shank Length 1 1/2 / 38.1mm Diameter of Head 3/32/2.4mm