A unique double flute design assures the penetration of soft or thin materials at the proper speed. Drill hole sizes from 1/8 in to 1 in in sheet metal without burring or deforming stock or threading drill bit. Malco® step Drills actually de burr as they drill. Perfect for use as a inhole-opening in reamer. They can also be used for making round holes from slots or intersecting holes. Made of industrial grade high speed steel. Malco® step Drills are heat treated and tempered to assure maximum strength for long wearing rugged use. Completely resharpenable.