Irwin 3041002 Speedbor Max 5/8-Inch by 6-Inch Self Feeding Spade Bit

Irwin 3041002 Speedbor Max 5/8-Inch by 6-Inch Self Feeding Spade Bit Amazon.com The Irwin Speedbor 5/8-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.