The Mueller-Kueps Carbide Milling and Grinding Burrs Set, No. 297 001/KIT5, is ideal to use with the company's Micro Die Grinder, No. 297 001. The burrs can be used for any steel application, making it easier to drill out hard metals such as broken taps or drill bits. Users can also use them to drill out broken bolts, cut through the outer race of a bearing, grind bumpers, dashboards, and more.