Spade Bit Set, Carbon Steel, Dia 1/4 to 1 In, Shank Size (In) Hex 1/4 Quick Change, Overall Length 6 In, For Use With 3/8 or 1/2 Drill, Number of Pieces 13, Includes 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, And 1 In Bits
13-Piece Speedbor Wood Boring Bit Set, includes 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, and 1-inch, for use in all 1/4-inch and larger electric drills. Bits have patented micro-groove point and cutting edge with extended spurs to bore two times faster and three times longer. Includes rack. Irwin tools are made of only the finest materials, manufactured to exacting tolerances.