60-degree cone burs debur and countersink holes and bevel and chamfer edges that have a 60° angle. They have a sharper (more narrow) angle than 90° cone burs (SK) for use in tight spaces. 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.