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.