0.625 in. Diameter al aly rod qq-a-22518, temper t-651, process sulfuric acid anodize per mil-a-8625 ty ii cl 2, color no. 37038 per federal std-595; lg 0.970 in. Nom; 0.560 in. Diameter nom; one end has inside diameter 0.437 lg 0.500 in.; other has inside diameter 0.3750 lg 0.470