Lenox Industrial Tools 10954-300S General Bi-Metal Utility Bit Kit, 3-Piece Extreme Durability - High speed steel cutting edges provide long life in tough applications, including nail-embedded wood Optimized for cordless drilling - smooth, effortless drilling extends battery life Fast clean cutting - 3 cutting edges enhance chip removal for a fast, clean hole Resharpenable - Resharpen with LENOX Diamond file