High Quality- The compressed air fitting is made of premium A3 carbon steel heat-treated, nickel-plated surface treatment which is hard to leak and durable. Sturdy and durable, rust and corrosion resistant. ensure long-term operation. Airtight Design: Our spring-loaded quick release features a built-in valve that locks in air when changing tools. This makes replacement safer and faster. 1/4" Pneumatic Quick Couplers - High precision thread for firm closing - Durable and long lasting. The connection does not fall off under high pressure and is safe and reliable. Wide Application- These air couplers are suitable for compressed air tools, air compressors, air lines, etc. and are suitable for 1/4" BSP fittings and fittings. Reduce accidental air line disconnection when changing between tools. Easy to Use- Detachable 1/4" air connector connects or separates the hose with a quick connector, making it easy to use and saves time and effort. Scope of delivery- The fittings are suitable for compressed air compressors and compressed air devices with 1/4" thread (EU standard size). 1/4" BSP threaded pipe fitting includes 1 external threaded socket, 1 female threaded socket, 4 male threads, 4 internal threads.