LOOYUAN 20pcs 3mm Shank Tungsten Steel Solid Carbide Rotary Files Diamond Burrs Set Fits Dremel Tool for Woodworking Drilling Carving Engraving shank diameter: 3mm(about 1/8''); grinding head diameter: 3mm Totally 20 pieces, double cut 10 pcs, single cut 10 pcs Works with mostly small rotary tools for DIY carving fans Product length: 38.5mm; net weight: 67.3g Box dimension: 100x65x12mm; box weight: 26.8g