Neiko 13000A Heavy Duty Carbide Double Cut Rotary Burr Set with Storage Case (4 Piece), 6" Durable, diamond cut carbide construction features two flutes for more cutting edge to remove material faster and produces smaller chips for a smoother finish Four piece variety pack comes in four shapes for intricate carving projects, rounding off edges, contoured finishes and long pointed edge offers access to hard to reach area; ball shape 3/8", Radius Ends: cylindrical 3/8"x3/4", tree shaped 3/8"x3/4" and tree shaped 1/2"x1" Extra strong burrs with 1/4" shank can be used to cut into aluminum, ferrous/non ferrous material, soft steel, plastic, wood, nickel, zinc, titanium and much more Multi-item set is the perfect tool for many industries including engineering, woodworking, jewelry-making, welding, and automotive and others Cutting tool can be used with most air tools including pneumatic drill, air grinder, high speed engravers and more while maintaining long life