Daredevil, Nail Killer, 5/16" x 7-1/2, Auger Bit, Easy In Wood, Tough On Nails, Dual Cutting Edges Deliver Easier Nail Cutting & Balanced Drilling, Open Faced Flute Offers Improved Chip Removal, Reinforced Tip Withstands Repeated Nail Hits, Reamer Edge Provides Improved Entry & Exit Hole Quality, 9X Life With Nail Hits.