Material:Alloy Steel Size:M2 M3 M4 M5 Drive System:Hex Socket Head Head Style:Flat, Hex Exterior Finish:12.9 Grade Alloy Steel Package including: M2: Total 110 x M2 screws; 110 x M2 Nuts; 120 x M2 Washers; 80 x M2 Lock Washers. M3: Total 110 x M3 screws; 110 x M3 Nuts; 120 x M3 Washers; 80 x M3 Lock Washers. M4: Total 110 x M4 screws; 110 x M4 Nuts; 120 x M4 Washers; 80 x M4 Lock Washers. M5: Total 75 x M5 screws; 75 x M5 Nuts; 80 x M5 Washers; 80 x M5 Lock Washers. 4 x hex keys. 24 Sizes More Choices, Custom 6 Lengths(8/10/12/16/20/25mm) for 1 Model, Nuts and Bolts Assortment Kit. Product Feature 1. Large nuts and bolts assortment kit: M2: Total 110 M2 screws; 110 M2 Nuts; 120 M2 Washers; 80 M2 Lock Washers. M3: Total 110 M3 screws; 110 M3 Nuts; 120 M3 Washers; 80 M3 Lock Washers. M4: 110 M4 screws; 110 M4 Nuts; 120 M4 Washers; 80 M4 Lock Washers. M5: 75 M5 screws; 75 M5 Nuts; 80 M5 Washers; 80 M5 Lock Washers. 4 hex keys. 2.Metric flanged assortment bolts and nuts made of upgraded zinc electroplated version, extended rust prevention time, more elaborate production process, no need to add anti-rust oil, cleaner and tidier. Whether for your own use, or as a gift for others, it is a very good choice. Each screw is packed separately in a transparent bag. 3.Hex socket head cap machine screws, durable nuts and bolts. Extraordinary Technology & Professional & Durability. Must have for modifications and tinkerers. The variety of sizes work perfectly for all the different projects. 4. Metric Bolt Assortment Can Be Widely Used in all kinds of precision machinery, classified instruments, instruments, electronic products, household appliances, communication products, locks, lamps, lights, toys, etc.