These are a true flat bottom drill capable of leaving a burr formation of less than 50µ. They have an n7 diameter tolerance which is suitable for use as a pilot drill for our entire ratio portfolio as well as our deep hole drills. RT 100 FB drills are ideally suited for drilling into oblique or curved surfaces. Piloting in all situations up to a 45° angle. Available from stock as coolant-fed 3xD drills Ø3.00-Ø20.00