DeWalt DW1587 6-Piece Spade Drill Bit Set"DEWALT ACCESSORIES" Spade Drill Bit Set The dewalt DW1587 6 Bit 3 8 Inch to 1 Inch spade Drill Bit Assortment includes six commonly used high performance drill bits to complement your tool set. The set features the Max Life corner that preserves nail life, the extreme speed channel for efficient chip removal, and a 1 4 inch ball groove shank for quick bit changes. Dewalt spade bits are designed with heavy duty shanks for extended life and durability.