Irwin Speedbor 4-Piece Woodboring Spade Drill Bit Set

4-piece spade bit set. Wood boring, 4 In. length for drilling in tight spaces. Double cutting spurs scribe the outside of the hole, reducing breakout, thicker cutting edge for longer drilling life. Patented blue groove point & cutting edge for faster chip removal. Larger shank for durability, quick change shank fits all standard 1/4 In. quick change chucks. Set includes one each: 5/8 In. speedbor, 3/4 In. speedbor, 1 In. speedbor, 1- 1/2 In. speedbor.