What is this component for on corsair h100i


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I just purchased corsair h100i for my i7 3770k. I have no problem and fitting and working was fine. But there is this component -


I don't know what purpose it serves and how to fit it. According to manual, i had just to be kept on that block after putting it on processor and put some strange screws in it that don't even go into anything. Now first, i don't see any purpose for this thing. Second, if i put it according to manual, it will just fall off! So please give me directions.
More info - my mobo is Asrock extreme 4 and cabinet is cooler master 690 2 plus and my radiator position is at top.
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