Patented micro-groove cutting edge and spurs produce a smoother hole finishDouble spur design scribes the hole before the chips are made, producing a cleaner hole and reducing vibration1/4" hex shank fits all drills and 1/4" quick change adaptersBores two times faster, lasts three times longer
Double spur design scribes the hole before the chips are made, producing a cleaner hole and reducing vibration. Irwin 88889 Speedbor 3 Piece 1/2-Inch, 3/4-Inch, and 1-Inch Spade Drill Bit Assortment.
Brand: Irwin Tools, Model: 88889SM