I have two of these C-L 115 piece Aviation bit sets.
http://www.grainger.com/product/CHICAGO-LATROBE-Jobber-Drill-Bit-Set-1G915
They are cobalt steel, made in the US, and come in HUOT index boxes. Top notch stuff. I will be selling 1 of them soon, as soon as I replace the few missing bits so...