The DEWALT 29 Piece Extreme 2 Metal Drill Bit Set have a specially designed tip which starts on contact for clean, accurate holes and reduces lock up on breakthrough. They also have a tapered web which provides greater durability to reduce breaking. Size markings are located above the shank to prevent wearing away and the bits also incorporate a no spin shank that eliminates the frustration of the bit spinning in the chuck. Contains: Sizes: 1, 1.5, 2, 2.5, 3, 3.2, 3.3, 3.5, 4, 4.2, 4.5, 4.8, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5 and 13mm.