Irwin Tools 3041003 Speedbor® MAX Speed Drill Bit Set, 6", 3-PieceCutting spurs have 3 cutting edges for added durability. Full screw tip allows bit to self feed. Grooved hex shank prevents slipping in drill chuck or bit extension. Tri Flute design for faster chip ejection. 3 Piece Speedbor max drill bit set Includes: 5 8", 3 4" & 1" Standard length Tri flute design for faster chip ejection Cutting spurs have 3 cutting edges for added durability Full screw tip allows bit to self feed Grooved hex shank prevents