Black & Decker Bullet Masonry bits have a patented speed tip design that penetrates surfaces quickly, drilling up to 2 times faster than competitive drill bits. The innovative flute design removes material faster for easier drilling and more speed. This super efficient design drills up to 6 times more holes per battery charge with cordless drills. Commonly used for drilling anchor holes when installing flag poles, mail boxes and running electrical conduit and are idea in all masonry applications. 5 piece set includes: 3/16-Inch, 1/4-Inch, 5/16-Inch, 3/8-Inch and 1/2-Inch bits