12PCS 1/4'' NPT Air Coupler & Plug Kit, Industrial Type D Quick Connector Set, Air Compressor Hose Fitting Kit (Black) Features: Superior Quality: Built with metal for high strength, coated with black anodizing for rust and corrosion resistance, durable and long-lasting. Standard Design: This industrial-grade M/D type air fitting is designed with four large locking balls to secure and lock the plug, ensuring a reliable connection. With a basic body size of 1/4 inch, it meets industry standards. Quick Connection: The installation is simple and the disconnection is quick, and compatible with most coupler plugs, avoiding air leaks and frequent replacements. Wide Application: This air coupler kit is suitable for a wide range of uses, including air tools, air compressors, air hoses, pneumatic nailers, pneumatic blow guns, and high-pressure washers. Package Content: 6pcs 1/4 MNPT air plugs, 4pcs FNPT air plugs, 1pc MNPT air coupler and 1pc FNPT air coupler, nearly fulfilling all your fundamental needs. Specifications: Item Name: Air Coupler Kit Main Material: Metal Color: Black Package Information:  Package Size: 15*10*2cm/5.91*3.94*0.79inch Package Weight: 369g/0.81lb Package List: 1 * 1/4" FNPT Coupler 1 * 1/4" MNPT Coupler 4 * 1/4" FNPT Plug 6 * 1/4" MNPT Plug