NEW air damper draft control knob kit (2 air twists and hardware) that has a high gloss nickel finish with high temperature metallic black paint accents. 3 5/8″ OD Fisher style draft control air inlet damper knob have (2 5/8″ ID center air relief) see pictures. Made from aluminum with steel retaining nut. Again, this is for 2 air inlet damper control twists and the hardware: 2 bolts and 4 nuts. Each twist uses one bolt and two nuts. Aluminum threads will always have a shorter life span than brass, bronze or steel threads. These knobs have both steel threads and the fast, heat dissipating quality of aluminum. 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.