These DEWALT(R) Spade Bits feature Extreme Speed Channels for fast chip removal and heavy-duty shanks for durability. This set includes six commonly used spade drill bit sizes to for variety of applications. The dual, precision-ground cutting edges deliver maximum speed and performance. The patented corner design helps preserve life and protect against nail impact. A 1/4 in. ball groove shank is compatible with most drills. | DEWALT Heavy Duty Spade Drill Bit Set DW1587