• 500-piece kit with 16 different models of screws and nuts. • Includes sizes M3, M4, M5, and M6 with lengths ranging from 10 mm to 30 mm. • Made of high-hardness grade 12.9 carbon steel with a black finish. • Oxidation, corrosion, and wear-resistant material for a long service life. • High-precision standard metric threads that prevent deformation and slipping. • Equipped with hex keys for easy use and immediate installation. • Organized in a transparent plastic box with labels to identify each model. • Ideal for applications in industry, furniture, automotive, machinery, and DIY projects.