Kyle Mills - world's No. 1 ODI bowler

AFP
It is Mills' normal length that gives him this success. He is tall and can bowl into the wicket on a shortish but not a pull-able length. That length is quite effective in the subcontinent.
When Mills has been hit, it has been when he has got a little full or batsmen have attacked him on the up. This is dangerous for them as he does get some movement in the air and can get it off the wicket too.
Combine that with his accuracy and he gets good players out, just as he got Ricky Ponting out in the Champions Trophy final.