Built to withstand demanding materials, the 7/8 in. x 3 in. x 6 in. Rotary Percussion Drill Bit is made of copper braze material for high heat resistance. The chrome-vanadium spring steel shaft adds durability for extended bit lifetime and the double-ground, extra-deep flute removes debris fast for increased visibility. This bit works in hammer drills with a 3-jaw or Jacobs chuck.