IRWIN 4935076 Hammer Drill Bit Set, Carbide, Silver, 5-Piece, For Hammer Drills with 3-Jaw or Jacobs Chuck      Bits feature aggressive diamond-ground tips for fast drilling, optimal flute design for fast dust removal and a shortened carbide tip that allows dust to move into the flute quickly reducing build up. Includes one 5/32 in x 6 in, 3/16 in x 6 in, 1/4 in x 6 in, 3/8 in x 6 in and 1/2 in x 6 in.