Irwin IWAX236PC Speedbor Max Drill Bit Set, 6 PieceHighlights: 6 Piece 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 slipping in drill chuck or bit extension Fits all standard 1 4" quick change chucks Includes 1 2", 5 8", 3 4", 7 8", 1" & 1 1 4" sizes, standard length WARNING: Some dust created by power sanding sawing grinding drilling and other construction activities contains