Check the listing for details. KF-40 (NW-40) Flange Quick Clamp Wing Nut with Centering O-Ring Aluminum. Condition: New, Made in China. Listed at 12.95 USD. [Size]: Quick Clamp Fits KF-40. [Quality Materials]: The Hinge Clamp is made of high-quality aluminum and the centering ring is made of high-quality aluminum and buna which is durable, stable, rust and corrosive resistance and good for long time using. [Precise Design]: The Centering Ring Vacuum Fttings can be used for connecting standard NW/KF-40 vacuum components. [High Working Temp. & Wide Range of Applications]: The Quick Clamp can be used for connecting vacuum pipes or tubes in the same direction in the double seal system. It is suitable for different media including water, gas, and oil with working at -58°F~392°F. [Convenient organization and storage]: Packed in a small plastic bag with label.