Oetiker 10100027 Zinc-Plated Steel Hose Clamp, Double Ear, Clamp ID Range 16.2 mm (Closed) - 20 mm (Open) (Pack of 100) Two ears for nearly double the clamping range of one-ear clamps Applies uniform force for secure clamping Accommodates thermal and vibrational expansion for a surer hold than other clamp types