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 1