I should have said drill index is fancy word for set of drill bits. With enough practice you can resharpen bits on a beltsander. You can even change the angle a bit for different material.
I like those no-spin drills too. Great idea. If you ever do resharpen bits be careful drilling aluminum, too aggressive an angle will grab and twist your wrist.Also there are different cutting fluids/oil for aluminum vs steel and iron.
Chris
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1968 104 , service replacement '96 K301, 42" deck
1997 Scotts 42502X8 , repowered with '96 B&S 18hp TwinII , 42" deck
2007 LA130,21hp Intek v-twin, 48" deck
 As you slide down the banister of Life, may the splinters point in the right direction . 
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