Tools 228pcs/box PC Computer Screw Bolt Standoff Washer Set228pcs box Hard Disk Motherboard PC Computer Assemble Case Fan Hand Screw Bolt Standoff Washer Set Assortment Kit Set contains: Main board conventional copper column (M3 x 6 + 6) : 24 pcs Main board fixed screws (M3 x 5) : 30 pcs Main board insulation gasket (red M3 x 8) : 30 pcs CD ROM set screws (M3 x 4) : 30 pcs Hard drive screw (M3. 5 x 5) : 30 pcs Chassis hand twist screws (silver M3. 5 x 5) : 6 pcs Chassis hand twist screw (black M3. 5 x 5) : 6