What is this strange screw type thing?

[ChrisGlobe]

Came with my 600T, only just noticed it whilst clearing out all the packaging!



Any ideas?

[Clockwise]

My guess is part of the lock for the top/sides.

[wonderlust]

is it the same height as a stand off?

Could be a special stand off to help postion the motherboard, had them in a ThermalTake case

[ChrisGlobe]

Smaller than a standoff as far as I can tell, so possibly part of the locking system as Clockwise says? I'll leave it in my "box of bits" anyway!