Dewalt 6 PC. Spade Bit Set 3/8-Inch to 1-Inch 6-PieceThese DEWALT 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.