Hougen® Copperhead Annular Cutter KitCopperhead Cutters Kit 9 16'' to 1 1 16'' x 2'' Copperhead Carbide Tip Annular Cutters feature a durable grade carbide insert for extended tool life when used with Hougen Mag Drills on abrasive and tough to cut materials. The unique Hougen design also includes a special tool geometry that helps maintain better chip flow than other brands.