Thunderbolt Web, 29 Piece, Jobber Length, Black Oxide Drill Bit Set, Sizes: 1/16" Thru 1/2" By 64Ths, With Indexed Case, Provides Longer Life & Faster Driller Times, Parabolic Flute, Clears Chips Faster, 135 Degrees Split Point, Precision Start No Walking, 3 Flat Secure Grip Shank, Reduces Bit Slipping In Chuck, Clamshell Packaging.