CB6000: 3 1/4" length 1 3/8" inside diameter cage - most popular size 5 ring sizes - 1 1/2"I.D., 1 5/8"I.D., 1 3/4"I.D., 1 7/8"I.D., 2"I.D.   CB6000S: The rings come in 5 sizes: 1.5", 1 5/8", 1.75", 1 7/8" and 2"...