Steel; consists of tray pivot, and pivot shaft; 5.000 in. W, @3.000 in. H, 4.250 in. Lg along shaft; shaft 1.000 in. Square at end opposite pivot tray for a distance of 1.312 in.; remainder of shaft 1.188 in. Od, two 5/8-18 unf thd holes through pivot tray; holes spaced 3.500 in. C to c