260Pcs M3 10.9 Grade Carbon Steel Hex Socket Flat Countersunk Head Screw Bolts Assortment Set.      Features:  1. The length of a flat socket head cap screw is measured from the top of the head to the flat of the point unlike other socket products(button head) whose length measurement is from underneath the head to the flat of the point.   2. Made of carbon steel, extremely high hardness, makes them good at resisting abrasion and retaining shape. They can withstand significant force before deforming.  3. Black appearance, dark color will fit well in different occasions.  4. Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry.  5. Comes with a delicate plastic organizer box for storage, also suitable for collecting your small accessories. Specification:  Material: Carbon Steel;  Color: Black;  Size: M3;  Screw Drive Type: Hex Socket;  Screw Head Type: Flat Head(Countersunk Head);     Package Included:  Item Length Quantity  M3 Screw 5mm 20Pcs;  M3 Screw 6mm 20Pcs;  M3 Screw 8mm 20Pcs;  M3 Screw 10mm 20Pcs;  M3 Screw 12mm 20Pcs;  M3 Screw 14mm 20Pcs;  M3 Screw 16mm 20Pcs;  M3 Screw 18mm 20Pcs;  M3 Screw 20mm 20Pcs;  M3 Screw 25mm 20Pcs;  M3 Screw 30mm 20Pcs;  M3 Screw 35mm 20Pcs;  M3 Screw 40mm 20Pcs;  Total Quantity / 260Pcs