DEWALT One-Piece Carbide Core Bits feature a low-friction core for fast drilling and rugged one-piece design. An alternating tooth design boosts durability and helps you center with ease. A tool-free centering bit enables fast, easy removal. Our accessories have all been developed for you, to meet and exceed your needs. We spend thousands of hours on the jobsite every year, testing and re-testing our accessories with the people who know best . you. So when you buy a DEWALT accessory, you can be confident that we have put as much thought into it as you would. We mean long life. We mean efficient performance. We mean innovative solutions to solve your frustrations.