1/2" x 16" x 21", SDS-Max Speed-X, Carbide, Rotary Hammer Drill Bit, Highest Drilling Speed With Inclined Side Cutters Provides Fast Concrete Drilling, Compact Head For Fast Dust Removal & Longer Life, Active Centering Tip Provides Quick, Accurate Starts, Wear Mark Indicator Assures Accuracy Of Hole Diameter.