B201SC400 - Double Cut Carbide Burs Cylindrical Radius End 1/4? Shank 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 2 3/4/69.85mm Diameter of Head 7/16/11.2mm