Features: If you are building computers then these are an absolute mustSet contains:Main board conventional copper column (M3 x 6 + 6) : 24 pcsMain board fixed screws (M3 x 5) : 30 pcsMain board insulation gasket (red M3 x 8) : 30 pcsCD-ROM set screws (M3 x 4) : 30 pcsHard drive screw (M3.5 x 5) : 30 pcsChassis hand twist screws (silver M3.5 x 5) : 6 pcsChassis hand twist screw (black M3.5 x 5) : 6 pcsChassis high-strength screw (M3.5 x 6) : 24 pcsConventional chassis fan retaining screw (white zinc M5 x 10) : 24 pcsConventional chassis fans retaining screw (black M5 x 10) : 24 pcsSpercifications: Material: metal(screws) + plastic (box)Color: as photo showsBox size: 13.2cm/5.20"x 7cm/2.76" x 2.3cm/0.91"(L X W X H)Weight(packaging weight excluded):8.00ozNote: The above numbers behide M are for screw tooth diameter x length,the unit is mm.Example: copper column (M3 x 6 + 6)It's specifications for: screw tooth diameter is 0.11in,teeth length is 0.23in,hexagonal copper column upper part is 0.23in long(Attention: The main board copper column for the conventional chassis use teeth for 0.11in in diameter,there may be a few special specifications chassis can't compatible with use.)Package includes: A set of computer screws (228pcs)