Milwaukee 48-89-9105 1/4-Inch to 3/4-Inch 3/8-Inch Shank Step Drill Bit
Milwaukee's Step Drill bits are made from a high alloy, premium industrial grade steel. Step drill bits allow you to quickly and easily drill a variety of round holes in steel, brass, copper, aluminum, wood, Plexiglas and plastic.  The balanced double flute design provides two cutting edges for easier, faster cutting in soft or hard materials.  One per package.