6 piece, speedbor max drill bit set, includes 1/2", 5/8", 3/4", 7/8", 1" & 1-1/4" sizes, 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 slipping in drill chuck or bit extension, fits all standard 1/4" quick change chucks.