Champion Proline CM9-SET5 SDS Plus Rotary Hammer Bits, 5-Piece Carbide tip for good penetration of material Reinforced flute geometry to reduces vibration Bits include : 5/32-Inch, 3/16-Inch, 1/4-Inch, 3/8-Inch, 1/2-Inch Modern heat treat and brazing processes assure proper hardness Reinforced flute geometry transfers more impact energy to the cutting face