Metric Nuts Size: Metric nut kit are available in sizes:M3(45 pcs),M4(30 pcs),M5(26 pcs),M6(22 pcs),M8(9 pcs),M10(9 pcs) M12(4pcs),145 pieces in total. 7 different sizes to meet your needs in different scenarios | 304 Stainless Steel Hex Nut: Stainless steel hex nuts are made of high-quality 304 stainless steel and have a long service life. They are rust-proof, corrosion-resistant, and sturdy. The spiral pattern and polishing process ensure a smooth surface that won't scratch your hands | Convenient Storage: Hexagon nuts(7 different size) are arranged to the size and placed in a transparent storage box with size label, to prevent loss or mixing | Wide Application: Hardware nuts are used to secure components, link pipes and structural elements. It can be widely used in all kinds of precision machinery, classified instruments, instruments, electronic products, household appliances, communication products, locks, lamps, lights, toys, etc | Attentive Service: Thank you for your support. If you have any questions about the hex nuts, please tell us. (NOTE: Do not over-tighten your hex nuts.)