Description:  228pcs Computer Screws for Motherboard PC Case CD-ROM Hard disk Notebook Screws.     It contains:  Main board insulation gasket (red M3 x 8) : 30 pcs;  ①Main board fixed screws (M3 x 5) : 30 pcs;  ②Chassis hand twist screws (silver M3.5 x 5) : 6 pcs;  ③Hard drive screw (M3.5 x 5) : 30 pcs;  ④Chassis hand twist screw (black M3.5 x 5) : 6 pcs;  ⑤Main board conventional copper column (M3 x 6 + 6) : 24 pcs;  ⑥Conventional chassis fan retaining screw (white zinc M5 x 10) : 24 pcs;  ⑦Cd-rom set screws (M3 x 4) : 30 pcs;  ⑧Chassis high-strength screw (M3.5 x 6) : 24 pcs;  ⑨Conventional chassis fans retaining screw (black M5 x 10) : 24 pcs;     Note:  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 3 mm,teeth length is 6 mm,hexagonal copper column upper part is 6 mm long;  (Attention: The main board copper column for the conventional chassis use teeth for 3 mm in diameter,there may be a few special;  specifications chassis can't compatible with use.);     Tool box specification: 130(L) * 65(W) * 23(H) mm;     Package included:  1x Transparent plastic case;  30x Main board insulation gasket (M3 x 8);  30x Main board fixed screws (M3 x 5);  6x Chassis hand twist screws (silver M3.5 x 5);  30x Hard drive screw (M3.5 x 5);  6x Chassis hand twist screw (black M3.5 x 5);  24x Main board conventional copper column (M3 x 6 + 6);  24x Conventional chassis fan retaining screw (white zinc M5 x 10);  30x Cd-rom set screws (M3 x 4);  24x Chassis high-strength screw (M3.5 x 6);  24x Conventional chassis fans retaining screw (black M5 x 10)