Personally I see no need to use those expensive drills. The flute is too long and causes the drill to be too flimsy, thus walking may occur. There is no way you will be having chips flow all the way down the flutes. Aircraft drills are the way to go. You can get them 12 inches and over in total length but the flutes will only be 2 inches long. Cut them to the length you want. You are going to be relieving the chips every 1/4 to 1/2 inch you drill in depth so no need for 6 to 8 inches of flute. I would also go with a 5/32 size dia. as that is the size of the nose grommets and the added dia. will give you a more rigid drill. Now I am sure some guys use the brads and love them but IMO you will be better off and save some $$$. You can get them in cobalt for longer wear too if you want to spend a little extra.
http://www1.mscdirect.com/CGI/NNSRIT...MT4NO=35075557
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