Features: Crafted from stainless steels material, highly strength, corrosion and antirust, not easy to break, can maintain highly performances even in harsh environment. Flat head makings flat head machine screws easy to use in tight or flushes place. Thread is deep and clear, and hexagon socket will not slip out when rolling up and installing, easy for daily use. Suitable for household, commercial, car, ship, communication equipments, electronics product, DIY projects, etc. Also suitable for 3D printers, computer, TV, lamp, cabinets, plumbing, etc. All key screws is stored in a clear storage box with compartments, is well organized, easy to carry and find. Specifications: Material: Stainless Steels Size: As Show In Picture Package Includes: 35pcs M2x20mm 35pcs M2x16mm 40pcs M2x12mm 40pcs M2x8mm 160pcs M2xNuts 160pcs M2xWashers 35pcs M3x20mm 35pcs M3x16mm 40pcs M3x12mm 40pcs M3x8mm 160pcs M3xNuts 160pcs M3xWashers 25pcs M4x20mm 25pcs M4x16mm 30pcs M4x12mm 30pcs M4x8mm 120pcs M4xNuts 120pcs M4xWashers 15pcs M5x20mm 15pcs M5x16mm 15pcs M5x12mm 15pcs M5x8mm 70pcs M5xNuts 70pcs M5xWashers 1pc Tweezers 1pc Wrenches M2x2 1pc Wrenches M3x2 1pc Wrenches M4x2 1pc Wrenches M5x2 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.