PC Computer Screws & Standoffs Kit 228pcs:24 pcs Main board conventional copper column (M3 x 6 + 6) 30 pcs Main board fixed screws (M3 x 5),30 pcs CD-ROM set screws (M3 x 4) 30 pcs CD-ROM set screws (M3 x 4),30 pcs Hard drive screw (M3.5 x 5) :