One set included all pc buliding screws:1:hard drive screws;2:fan screw;3:Motherboard fixed screws; 4:motherboard standoffs with brass and iron two types; 5:M3 washer;6:Chassis screw;7:thumb screw 8:CD-ROM set screws 10pcs Thumb screw(#6-32*6mm) , 100pcs Chassis screw (#6-32*6mm), 100pcs screws for hard drive(#6-32*5BM),100pcs case screw for motherboards fixed screw(M3*6) , 50pcs case fan screw (5*10KB), 100pcs CD drive set screw (M3*5),50pcs brass pillar standoffs for mainboard m3*6+6, 50pcs iron pillar standoffs for mainboard m3*6+6, 100pcs insulated washers in one plastic case(M3)