Check the listing for details. Kutzall Original Rotary Burr Set - 1/8" Shaft - Fine - 4 Piece. Condition: New. Listed at 64.48 USD. Kutzall Original Rotary Burr Set - 1/8" Shaft - Fine - 4 Piece, 189973, 1/8" shaft burrs are used in flex shaft tools, hand grinders, or other machinery using collets or adjustable chucks, Coating: Fine, Burr Material: Tungsten-carbide, Used for shaping, contouring, hollowing, notching and trimming and works great on wood, fiberglass, rubber, foam and soft stone, Head Diameter x Head Length: Taper 1/8" x 7/8", Sphere 3/8" x 3/8", Ball Nose 1/4" x 1/2", Flame 1/4" x 1/2", The Kutzall burrs are designed to provide fast stock removal with an outstanding finish, thanks to exclusive tungsten-carbide coatings that make them the best value in the industry. The 1/8" shaft burrs are used in flex shaft tools, hand grinders, or other machinery using collets or adjustable chucks. They are not.