Specifications: Made of 304 stainless steel, it has high hardness, and it is oxidation resistance and durability, rust-proof, anti-corrosion and wear-resistant. There are various types and sizes for selection, which will meet your multiple needs, and they are exquisite workmanship. It is widely used in all kinds of manual DIY production, precision machinery industry, 3D printing equipment, instruments, electronics, household appliances, lamp and toys, etc. Item Name: Hexagon Screws Kit Material: 304 Stainless Steel Quantity: 1120Pcs/Set Head Type: Countersunk Head Groove: Hexagon Socket Screw Diameter: M2, M3, M4, M5 Features: Durable, with Storage Box, Metric Screw Length: 8mm/0.31", 12mm/0.47", 16mm/0.63", 20mm/0.79" (Approx.) Storage Box Size: 19.6cm x 13.2cm x 3.6cm/7.72" x 5.2" x 1.42" (Approx.) Notes: The quantity is about 1120pcs, due to manual calculation, the quantity might has 1-10pcs more or less, hope you can understand, thank you. Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 125 x M2 Screw Nuts 105 x M3 Screw Nuts 85 x M4 Screw Nuts 65 x M5 Screw Nuts 125 x M2 Flat Pad 105 x M3 Flat Pad 85 x M4 Flat Pad 65 x M5 Flat Pad 30 x M2 x 8mm Screws 30 x M2 x 12mm Screws 30 x M2 x 16mm Screws 30 x M2 x 20mm Screws 25 x M3 x 8mm Screws 25 x M3 x 12mm Screws 25 x M3 x 16mm Screws 25 x M3 x 20mm Screws 20 x M4 x 8mm Screws 20 x M4 x 12mm Screws 20 x M4 x 16mm Screws 20 x M4 x 20mm Screws 15 x M5 x 8mm Screws 15 x M5 x 12mm Screws 15 x M5 x 16mm Screws 15 x M5 x 20mm Screws