[Assortment of well-made metric bolts and nuts]100% made of high-quality steel, high strength, excellent rust resistance, excellent oxidation resistance, very suitable for all weather use. The metric screw assortment conforms to the standard metric system with an average error of less than 0.01 mm. [1600 pcs in 16 standard sizes]: Various M2 M3 M4 M5 screws and bolts with lock washers, 16 sizes in total: M2 screws: Bolt length: 4mm, 6mm, 8mm, 10mm, M3 screws: Bolt length: 6mm, 8mm, 12mm, 16mm, M4 Screws: Bolt Length: 8mm, 12mm, 20mm, M5 Screws: Bolt Length: 1 2mm, 16mm, 20mm, 25mm, 1600pcs to meet all needs. 4 custom hex wrenches for each size are provided in the set to make the screws easier to access. [Upgrade Galvanized Screw Set]: All screws do not add any anti-rust oil, use upgraded black galvanized, prolong the anti-rust time, clean and tidy. It is an perfect choice whether you use it yourself or give it to your family and friends as a gift. [Beautiful Storage Box]: Bolts and nuts kits are packaged in a reinforced box with separate compartments and strong latches, clean and tidy, keep everything organized, easy to store and carry, transparent label board sticky On the inner and outer lids, giving you a quick idea of what size you need to use and refill. [WIDE APPLICATIONS]: This metric bolt assortment can be widely used in various precision machinery, 3D printers, electronic products, household appliances, toys, etc. Note: due to different production batches, the plastic box style is random Colour:black Material:steel Package Contents: 1 x Hex Button Head Cap Screws Bolts Nuts Washers Assortment Kit