[HawgRyder]

Jon...I wish I could get you the info on the drills...but...I originaly got them from the quartermaster in charge of the tool crib on the base I was stationed at!
All of them are aircraft length (long...some as long as 12").
I have seen sets for sale over the years...but I have been lucky that none of mine have been broken.
Since I got mine...I have noticed that drills of different materials seem to be preferred (other than diamond) so perhaps you might look at the latest alloys instead.
Bob