The Dewalt® SDS Plus 2 bit is equipped with a tapered core for strength and maximum durability, which is perfect when drilling deep holes. Its 2-stage flute design with variable helix pattern allows for efficient debris removal. Thanks to its 2-sharp cutting edges you'll get clean round holes with each use. A wear mark indicator provides an accurate diameter for holes. This bit has a 10" usable length and is backed by a NO BREAK GUARANTEE: If a bit fails for any reason while the wear mark is still visible, Dewalt® will replace it.