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 15 2 25 3 32 33 35 4 42 45 48 5 55 6 65 7 75 8 85 9 95 10 105 11 115 12 125 and 13mm