Contents: The compressed air quick connectors include 1 female thread with external thread, 1 female thread, and 4 external threads with external thread, as well as 4 external threads with female thread. In total, there are 10 air line connectors.Function: The compressed air quick connectors allow you to quickly connect and disconnect tools and air lines. They are widely used in pneumatic tools, automotive applications, compressed air systems, as well as machines and compressors, ensuring efficient and convenient use.Air Line Fittings Dimensions: The quick connect air fittings are 1/4" with external and internal threads for easy connection. They feature a 12.8mm hex female thread and a 12.8mm external thread, ensuring optimal compatibility with your pneumatic tools.Easy to Use: Simply slide the body in, push it into the socket, and push the body back to fully lock it into the connector. This ease of use makes the quick connect air fittings a practical choice for securely connecting your tools.Solid Materials: The quick connect air fittings are made of high-quality steel, providing exceptional strength, hardness, and durability. Their surface is electroplated to prevent rust and corrosion, ensuring long and reliable use.Convenient Design: This 1/4" quick connect air fitting is easy to install and Quick disconnect. Its intuitive design allows for easy handling, ideal for air line connections in industrial or domestic applications.