PC computer screws standoffs kit 310pcs,24pcs mainboard standoffs(M3x6+6mm) 45pcs hard driver screws(M3.5x5mm);12pcs Chassis hand twist screw (black and silver M3.5 x 5) 45pcs Main board fixed screws (M3 x 5), 45pcs CD-ROM set screws (M3 x 4),