This 12-pack of industrial air couplers features solid brass construction for excellent corrosion resistance and long-lasting durability. Each coupler has 1/4-inch NPT male threads with a 1/4-inch body size, interchangeable with most major manufacturers. The maximum working pressure is 300 PSI. The sleeve guard design provides a better grip when connecting and disconnecting while reducing the risk of accidental disconnects. Ideal for professional jobsites, automotive shops, or home garages with air tools, compressors, and nailers.