Carbide rotary burr 10pcs set,Shank Diameter: 3mm,3/32"; 1/8",1/4". Carbide rotary burr 8pcs set,carbide rotary file Shank Diameter: 3mm,3/32"; 1/8",1/4".Packing: 10pcs/set, or upon request.Used for shaping, smoothing & removal hardened steel, stainless steel, fired ceramics, plastics, hardwoods and so on.