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It dosen't have so much to do with the thickness, but the hardness of the steel. If it's pretty hard, you might want to step up to a 135 degree point. But if it's just mild steel, it will probably just slow you down a bit. Either way is fine, can't hurt.
If you can do split points on your Drill Dr. I'd definently consider doing that to most of the bits.
If you can do split points on your Drill Dr. I'd definently consider doing that to most of the bits.