5x 1/4'' 6mm Carbide Engraving Bit One Single Blade Flute CNC Router 30° 0.3mm,Blade Flute CNC Router 30° 0.3mm 5x 1/4'' 6mm Carbide Engraving Bit One Single, compare to the normal flat bottom engraving bit, this tool has a blade/flute on the cutter back side, and the length of blade/flute is designed longer than the normal flat bottom engraving bit, so you can handle easily in Hard Wood Carving, 2/3D Sculpture or Relievo design,This tool is specially designed for cutting and engraving, Single Blade Flute CNC Router 30° 0.3mm 5x 1/4'' 6mm Carbide Engraving Bit One.