Matl steel per mil-t-8606; tube 0.3125 in. Od, 0.028 in. Wall with flat ends 0.056 in. Thick by 0.44 in. Min and 0.47 in. Max wide; 1 hole 0.218 in. Min and 0.229 in. Max diameter in one end; slot 0.70 in. Min and 0.75 in. Max by 0.249 in. Min and 0.255 in. Max in one end