Contents: The compressed air quick connectors include 1 female thread with male thread, 1 female thread, and 4 male threads with male thread, as well as 4 male threads with female thread. In total, there are 10 air line connectors. Function: Compressed air quick couplers allow for quick connection and disconnection of 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 Fitting Dimensions: The quick connect air fittings are 1/4" with both external and internal threads for easy connection. They feature a 12.8mm female hex thread and a 12.8mm external thread, ensuring optimal compatibility with your air tools. Easy to use: Simply slide the body in, push it into the socket, and push the body back in to fully lock it into the connector. This ease of use makes compressed air quick couplers a convenient choice for securely connecting your tools.