Aluminum, spec qq-a-200/4; 6.310 in. Od one end, 10.120 in. Od second end; 25.230 in. Lg; item has a flange p/n 12313494-5, tube 6.000 in. Od p/n 12313494-7; flange p/n 12313494-6; damper p/n 12313468; actuating lever p/n 12313488, 2 ea screens p/n 12313474; shaft p/n 12313485