Fangrui Product Details Constructed From Heat-treated Hardened Steel With A Copper-plated , This Quick Coupling Compressed Air Set Is Robust, Rust-, And -proof, Ensuring A And Reliable Connection For All Your Pneumatic Needs. Featuring Airtight Design, Each 1/4 Inch Quick Connect Coupling Has A Built-in Valve That Automatically Shuts Off The Air When Switching Tools, Enhancing Safety And Increasing Efficiency During The Tool Change Processes. Ease Of Use Is With Our Quick Connect System For Air Compressors; Simply Pull Back The Collar, Insert The Plug, And Release To Lock Securely. Detach With A Backward Slide Of The Ring, Emphasizing Simplicity And Productivity In Pneumatic Operations. This Set Includes Versatile Fittings To Suit Configurations: 1 Large Female Connector With Female Thread, 1 With Male Thread; 4 Small Male Connectors, And 4 Small Female Connectors, All Tailored For 1/4 Inch Standard Air Hoses. For A Multitude Of Applications, This 1/4 Inch Quick Coupling Seamlessly Fits Pneumatic Tools, Air Compressors,