Features: Made of carbon steel, good corrosion resistance and will not rust, durable to use. Equipped with a plastic box, you can classify the screws in an organized way, more convenient to carry and remove. Use this fastener with the hex wrench to hold mechanical parts firmly in place. Different sizes for general use, meet all your needs. Widely used in home and office appliances, furniture and other machinery. Specification: Condition: 100% Brand New Material: Carbon Steel Color: Black Quantity: 240Pcs Type: M3x3, M3x4, M3x6, M3x5, M4x4, M4x5, M4x6, M5x5, M5x8, M6x6, M6x10, M8x8 (20Pcs Each) Box Size(LxW): About 17.5x10cm Weight: About 1.5kg 178g Package Content: 1 Box of 240 Hex Socket Screws Note: Please allow slight difference in color and measurement. Thanks for your understanding.