Set OF 8pc CARBIDE BUR BURR ROTARY TOOL BITS - SHARP 8pc Carbide Double Cut Burr Assorted Shape: Cylinder, End Cut, Radius End, Oval, Tree, Pointed End, Flame,Tapered Doube Cut Shank Diameter: 1/8" (3MM) Overall Length : 2" Double Cut is used on rapid stock removal in harder materials like Iron , Steel, Copper, Brass and other ferrous materials