B203SE500 - Double Cut Carbide Burs Oval Shape 1/4? Shank Oval 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 2 5/8 / 66.7mm Diameter of Head 1/2/12.7mm