Package Contents: Air hose couplings include 1 female coupling with male thread and 1 female coupling and 4 male couplings with male thread and 4 male couplings with female thread. A total of 10 air line couplings. Function - Air compressor couplings allow quick connection and disconnection of tools and air lines. Widely used in pneumatic tools, vehicles, compressed air, machinery and compressors. Air line couplings Dimensions: 1/4\" air hose couplings with external and internal threads for quick couplings for air. 12.8mm hex female thread and 12.8mm external thread. Easy to use: Simply slide the body, push it into the socket and push the body back to fully lock it into the connector. Solid materials: The quick-release air hose couplings are made of high-quality steel with high strength, hardness and durability. The surface is electroplated to prevent rust and corrosion. Convenient design - This 1/4 quick coupling is easy to install and quick to disconnect, ideal for air line connections.