The Irwin Speedbor 1/2-by-6-Inch Max Spade Bit is a fast speedbor spade bit that features a Tri-Flute design with a fast chip ejection. The Speedbor MAX has cutting spurs with three cutting edges for added durabilty, as well as a full screw tip allows the bit to self feed. The grooved hex shank prevents slipping in drill chuck or bit extension, while the bit itself fits all standard 1/4-inch quick change chucks.