Special design makes these drills three times faster than standard bits and they last three times longer! This convenient set has 13 of the most popular drill sizes that feature Boschs speed helix design. It makes them three times faster than conventional drills and, thanks to their Black Oxide coating, they stay sharper and last three times longer. They can be used for drilling steel, copper, aluminum, brass, wood, polycarbonate, acrylic, ABS, nylon, fiberglass and most composites. Durable Brute ToughTM has tilt-out indexes for easy access. Kit Contents: Brute Tough case with fold-out racks. Drill sizes 1/16”, 5/64”, 3/32”, 7/64”, 1/8”, 9/64”, 5/32”, 11/64”, 3/16”, 13/64”, 7/32”, 15/64” and 1/4”.