Cut your rough-cut holes in wood faster with DeWalt's self-feed bits. The two-cutter design is available from the smallest to the largest bit, unlike some of the competition that only uses it on sizes above three inches. The self-feed spur is extremely aggressive and can be replaced. Flats have been added to the bit shank to eliminate the shank spinning in the chuck. The 8-piece kit includes a 5-1/2-inch extension, 1-, 1-1/8-, 1-1/4-, 1-1/2-, 1-3/4-, 2-1/8-, 2-9/16- self feed bits, and replacement parts in a kit box.