Inverted cone burs (SN) finish and debur dovetails, inside edges, and inverted slots and holes. The cone-shaped cutting edge is wider at the tip to make V-shaped cuts and rear-side chamfers. Cone-shaped burs have straight tapered sides for smoothing beveled and chamfered surfaces, while the short cutting area maneuvers into counterbored holes. Cutting edges are made from carbide, which is a hard material that resists wear and limits heat. Carbide burs attach to rotary power tools such as die grinders, high-speed engravers, and pendant drills.