Copperhead™ Carbide Tip Cutters offer extended tool life on abrasive, tough-to-cut materials and in high-speed mag drills such as the HMD508. The unique Hougen design includes a special tooth geometry that helps maintain a better chip flow than other brands. Copperhead Cutters are available with two different shanks. The standard 3/4" two flat shank and the Fusion shank for tool-less magnetic drill arbors. Using the set screw arbor system can result in up to 2x the tool life as tool-less systems.