4"diameter Aluminum Dryer Duct - $0.59 Per Foot-buy up to 25'long Aluminum Foil Duct Hose with 2 Lambro Tention Clamps 4inch diameter for use on gas or el.driers ,bathroom fans, humidex etc... pay per foot, you buying one foot, add feet in quantity box 2 total Lambro clamps included with purchase