All of our clear, ducting flex hose (item #s beginning with DHF) are labeled with sizes referring to their inner diameter and maximum length. i.e. item # DHF060500 has an inner diameter of 6 inches and a maximum length of 5 feet.
No. There is a small section near the lock of the clamp where there are no holes. This portion has no holes because that is as far as the clamp can contract.