Alum alloy per qq-a-225/8, comp 6061-t6 or alum alloy per qq-a-225/3, comp 2011-t3; anodize per mil-a-8625, type 1; 0.680 in. Lg by 0.165 in. Od by 0.085 in. Id through by 0.215 in. Diameter both ends by 0.215 in. Lg; 0.153 in. Diameter crimping both ends