B219SF6AC - Aluminium Cut Carbide Burs Tree Shape Radius End 1/4? Shank Tree 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 1/4 Length 2 3/4 / 69.85mm Diameter of Head 5/8/15.9mm Length of Head 1 / 25.4mm