• Complete 500-piece set including hex head screws, nuts and washers in sizes M3, M4, M5 and M6.\n• Made of grade 10.9 carbon steel with a black finish, offering high hardness and resistance.\n• Includes screws of various lengths: 10mm, 20mm, 25mm and 30mm for each of the metric sizes.\n• The kit is accompanied by 4 Allen wrenches designed to perfectly fit the included screws.\n• Presented in a reusable and compartmentalized storage box to organize and avoid losing pieces.\n• Ideal for applications in precision machinery, electronics, home appliances, 3D printer components and general repairs.\n• Threads are uniform and resistant, designed to prevent deformation or slipping during use.\n• The included washers and nuts help expand the contact area and reduce pressure on the parts.