Dormer?s R100 jobber drills are made from premium carbide making them great for drilling hard and abrasive materials, with increased wear resistance meaning you get extended tool life and greater productivity. The tools have a bright finish which ensures clean and accurate results by preventing workpiece materials from sticking to the cutting edges of the tool. R100 carbide jobber drills have a 120 degree 4-facet point which both helps with self-centering and reduces the downward force needed to drill into the workpiece. R100 drills are very versatile and can be used with all CNC machine applications.