CHAMPION CM89HC Hammer Core BitsHammer Core Bits Heavy Duty, SDS Max or Spline Item #: CM89HC Drill Large Diameter Holes In Concrete And Hard Masonry Materials Ultra Sharp Carbide Teeth Penetrate Materials Quickly Centering Bit Centers Hole For Accurate Drilling External Spiral Flutes Optimize Dust Removal SDS Max Or Spline Shank Adaptors For Use In Rotary Hammer Drills Operate In Percussion Or Rotary Mode 11 In Extension Available For Applications Where Reach Is Required