Irwin 3041002 Speedbor Max 5/8-Inch by 6-Inch Self Feeding Spade Bit N/A Imported A fast speedbor spade bit that features a Tri-Flute design with a fast chip ejection Cutting spurs have 3 cutting edges Grooved hex shank prevents slipping Fits all standard 1/4-inch quick change chucks Full screw tip allows the bit to self feed