Material: Alloy steel has high strength, corrosion resistance, high hardness and long-term stability. Common sizes18 sizes. Suitable for most needs, give a screwdriver. Small screws are suitable for watch covers, glasses frames, notebooks, etc. Ideal for general purpose use which can meet your basic need. Easy to use: Flat head screws are more convenient to tighten, the screw head is sharp, easy to penetrate, suitable for metal plates, plastics, wood and other brittle materials. A convenient storage box: Equipped with a transparent plastic box with multiple partitions to keep each model separate, which makes you convenient to select the right screw type or put it back. After-Sale Service: Each Screw is durable and new designed. If you have any questions when you receive the item, please feel free to any time. We will solve problem within 24 hours. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''''''t hesitate to . We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.