PC Case Screw: 12pcs #6-32 UNC Screw with Phillips Pan Head for HDD 5 - 6 mm deepth To secure a 3.5" hard disk drive to the case (normally 4x screws for one HDD)To secure motherboard into the case (depends your stand off screw if same as #6-32)To hold an expansion card in place by its metal slot coverTo fasten case components to one another
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