B207SL420 - Double Cut Carbide Burs Taper Shape 1/8? 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 1/8 Length 1 1/2 / 38.1mm Diameter of Head 1/8/3.2mm Length of Head 1/2 / 12.7mm