It is a Carbide Engraving Bits/CNC Cutter/Milling Cutters/Drill Bits/CNC Conical V-Bit. Product Type: 2 flutes straight grooves cone metal engraving bit. Material: solid carbide. mainly used for the engraving and marking of stainless steel, aluminum, brass, medium density fiberboard, wood panels, plastic and many other soft gummy materials.