SUPERIOR QUALITY - This 1/4 inch (approx. 0.6 cm) NPT threaded quick connect air coupler plug kit is the best in terms of superior quality. Each female air coupler is made of iron with a solid brass exterior. This makes it suitable for long term use. STRONGER CONNECTION - This female air coupler has a longer life and stronger connection. It has 4 ball damping and a wide hexagonal area compatible with I/M/D air plugs. MULTIFUNCTIONAL TOOL - Our air compressor accessory comes in a brass finish, and the most surprising thing about it is its versatility. Ideal for auto stores and professional workplaces. Also, it can be used in garages for air compressors, air guns, air hoses, pressure washers, air spikes, air tools. Buy with confidence and easily switch between different air tools and accessories quickly during use. PRODUCT SIZE - Our 10-piece female air coupler is made of high quality material with professional design. Each female air coupler measures 1/4-inch NPT female x 1/4-inch and has a maximum working pressure of 300 psi. Interchangeable with most manufacturers, the tool locks easily onto the air hose. Milled Sleeve Design - Our female air coupler kits are easy to install and quick to disconnect. Each air coupler is expertly crafted with a commitment to ensuring your needs are met. It features a unique classic knurled sleeve design that provides better grip when connecting and disconnecting. A sleeve guard helps minimize the risk of accidental disconnection and protects the coupler sleeve.