5/16" x 6", Percussion Drill Bit, Flute Design Efficiently Removes Dust Reducing Bit Binding, Optimum Grade Of Carbide Maximizes Durability, Carbide Tip Provides Up To 2 Times Longer Life, Tip Configuration Reduces Walking For Improved Accuracy, Drills Up To 2 Times More Holes Than Conventional Percussion Bits, Drills 50% More Holes Per Charge With Cordless Hammerdrills.