Cut holes in cast iron, steel and ultra hard or exotic alloys with the added ability to produce overlapping and interrupted holes easily. Maximize cutting performance of any portable magnetic drill press. Their superior Triple Edge cutting action outperforms ordinary high speed steel annular cutters and twist drills 6:1. Cut clean, bur free holes. Precision pilot pins eject the center as a plug of steel. Features Weldon style flats for fast loading and better rigidty.