IRWIN Tools SPEEDBOR Blue-Groove Pro Spade Bit Set with Storage Case, 17-Piece (1792761) Blue-Groove point and cutting edge for chip removal 4 times faster than standard spade bits Each spade bit has double-cutting spurs to scribe the outside of the hole for reduced breakout A large shank on the spade drill bit provides added durability Paddle bit features a grooved hex shank to minimize slipping in the drill chuck or bit extension Flat bit fits most standard quick-change chucks