2.5" – COL-25-40, 2" – COL-2-40, 3" – COL-3-40, 4" – COL-4-40, 4" with 4.5" Schwing End – COL-45-40, 5" – COL-5-40, 6" (168mm O.D.) – COL-6-40-168, 6" (175mm O.D.) – COL-6-40-175