Specification: Model: MXCH3;  Mateiral: Carbon Steel;  Grade: 10.9;  Color: Black;  Screw Drive Type: Hex Socket;  Screw Head Type: Button Head;     Features: - 440pcs M3/M4/M5 hex socket button head screws nuts assortment.  - Black appearance, dark color will fit well in different occasions.  - Various diameters and lengths, completely diversified assortment, meet your different application.  - Made of carbon steel, extremely high hardness, makes them good at resisting abrasion and retaining shape. They can withstand significant force before deforming.  - Comes with a delicate plastic organizer box for storage, also suitable for collecting your small accessories.  - Apply to electronic, electrical appliances, chemical, cement, machinery and equipment, furniture ,quadcopter, FPV and so on.     Package Included: Item Length Quantity;  M3 Screw 8mm 20;  M3 Screw 12mm 20;  M3 Screw 16mm 20;  M3 Screw 20mm 20;  M4 Screw 8mm 20;  M4 Screw 12mm 20;  M4 Screw 16mm 20;  M4 Screw 20mm 20;  M5 Screw 8mm 15;  M5 Screw 12mm 15;  M5 Screw 16mm 15;  M5 Screw 20mm 15;  M3 Nut - 80;  M4 Nut - 80;  M5 Nut - 60;  Total Quantity: 440