Consists of boss, two plates per qq-s-635; one stop and one bar-qq-s-634; caseharden 0.016 in. Deep, paint per tt-e-527 federal std-595; one end 1.875 in. Od and 1.340 in. Id, middle 3.750 in. Diameter down to 2.253 in. Od, other end 1.560 in. Od and 1.500 in. Id