So far so Good
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28-11401 - 4" Worm Screw Clamp for Dryer Vent Hose
Adjustable from 3-9/16" to 4-1/2" diameter
Two each required for aluminum dryer vent duct (MCM part number 28-11400)
I've ordered several times from MCM and have always been very satisfied with their products, service and shipping.