Kent 10pcs Mixed Kit, 3/32" Shank Tungsten Carbide Rotary Burrs, with 1/4" Heads Fits Dremel 10pcs Mixed Kit, Tungsten Carbide Rotary Burrs, 3/32" Shank, 1/4" Heads 3/32" (2.35mm) Diameter Round Shank, Fits Dremel 1/4" Head size, 1-3/4" Overall Length Various shapes included, such as spheres, cylinders, bullets, needles, etc. For electric rotary tools, drills, high speed die grinders, and flex shafts