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.
From the Manufacturer
All DEWALT spade bits are designed with cutting spurs for optimum hole finish, a hang hole for bit storage & wire pulling, full length heat treat for longer life, flats on shank to prevent slipping in chuck, 1/4-inch Quick Change shank which fits all drills, and 1/4-inch quick change holders.