What is this little screw that i found while building my new pc?

Enfeeble

Honorable
Dec 13, 2013
49
0
10,540
http://tinypic.com/r/21l940p/8
http://tinypic.com/r/21l20e1/8
http://tinypic.com/r/5yrqj9/8

After finishing mounting my mobo to the nzxt 410.. i lifted the case back up from it's side and i found this little guy underneath my case. What is this? I check everywhere to find a similar piece and i failed.. I am not sure what it is...

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor ($249.99)
CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler ($94.99 @ Newegg)
Motherboard: Asus Maximus VI Hero ATX LGA1150 Motherboard ($194.79 @ Newegg)
Storage: Samsung 840 EVO 250GB 2.5" Solid State Disk ($139.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.99)
Video Card: Asus Radeon R9 280X 3GB Video Card ($328.99 @ Staples)
Case: NZXT Phantom 410 (Black) ATX Mid Tower Case ($89.99 @ Microcenter)
Power Supply: EVGA SuperNOVA 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($119.50 @ Amazon)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Total: $1388.19
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-06 23:05 EST-0500)