6 Piece, Speedbor Blue Grove Flat Bit Set, Blue Groove Point & Cutting Edge For Faster Chip Removal, Double Cutting Spurs Scribe The Outside Of The Hole Reducing Breakout, For 1/4" & Larger Electric Drills, Set Includes 3/8", 1/2", 5/8", 3/4", 7/8" & 1" Spade Bits.