Features: Used to connecting air hoses or air tool with 1/4inch NPT threaded end. Make of coppers Materials, strong and enduring, have good strength and durability. Enables tool and airlines to be quickly connecting / disconnect Simple to use, just slides back collar and insert the fitting, then slide collar fully back to lock in place. Quick and convenient connection system with great sealing and high efficiency. Specifications: Materials: Coppers Type: External thread/Internal thread External thread size: about 43x13x8mm/1.69x0.51x0.31inch Internal thread size: about 40x12x8mm/1.57x0.47x0.31inch Package Includes: 1Pc Quick Coupler note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.