Features: 12 most common selection of Hexagons Head screws(3mm, 4mm, 5mm), and metric size nut with wrenches. Make of Carbon Steel, highly hardness, no deformation, antioxidation, wear resistance, corrosion resistance. Small and force uniform screw thread is Not easily deformed and slids in process of rolling and installation. Widely used in boatings, print projects home appliances, communication equipments and other machinerys industry. All screws is store in a clear storage box with compartments, is well organized, easy to carry and find. Specifications: Materials: Carbon Steel Size: As Show in the Picture Package Includes: 35Pcs 3mmx8 35Pcs 3mmx12 35Pcs 3mmx16 35Pcs 3mmx20 20Pcs 4mmx8 20Pcs 4mmx12 20Pcs 4mmx16 20Pcs 4mmx20 15Pcs 5mmx8 15Pcs 5mmx12 15Pcs 5mmx16 15Pcs 5mmx20 140Pcs 3mm Nut 80Pcs 4mm Nut 60Pcs 5mm Nut 1pc Wrenchs note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.