B207SL200 - Double Cut Carbide Burs Taper Shape 1/4? Shank Taper 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 5/16/8.0mm Length of Head 7/8 / 22.23mm