B200SA400 - Double Cut Carbide Burs Cylindrical Square End 1/4? Cylindrical 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 /38mm Diameter of Head 1/8/3.2mm