Power through jobsite materials with the 5/16 in. x 2-1/2 in. x 4-3/4 in. Rotary Percussion Drill Bit, made with copper braze for a higher heat resistance. Designed to work with hammer drills with a 3-jaw or Jacobs chuck, this bit has a chrome-vanadium spring steel shaft for improved durability. The double-ground, extra-deep flute increases speed and visibility for a longer bit life.