THIS IS FOR ONE AIR TWIST ONLY. Made from high temperatures aluminum with a steel threaded retaining nut. These style were used on almost all pre 1990 wood burning stoves. Most common in Fisher, Lopi, Woodsman, Heat King, Fire King, Heritage, Frontier, Timberline, Goldenfire, Goldenflame, Englander, Blackgold ect. But can be used for any application that needs to control air flow. 100% MADE IN THE USA. Manufactured in Utah.