★【INCLUDING】4 x Male Fitting Male Thread, 4 x Male Fitting Female Thread, 1 x Female Fitting with Male Thread, 1 x Female Fitting with Female Thread ★【ADVANTAGE】1/4" BSP Air Line Connectors are made of heat-treated hardened steel with nickel plated surface that can resist rust and corrosion, Spring loaded quick release couplers for use on the compressor side have a valve built in to prevent air escaping while changing between tools ★【SIZE】1/4" BSP. Tightening 12mm hex (Male fitting Male thread) Tightening 16mm hex (Male fitting Female thread) Tightening 19mm hex (Female fitting Male/Female thread) Type: Male/Female fitting, male/Female thread ★【FUNCTION】Quick release couplers are very simple, just slide the collar back and insert the fitting, then push the collar back completely to lock it in place ★【TYPE】Male/Female fitting, male/Female thread. Suitable for pneumatic tools, air compressors, air pipes, automobile industry, etc