Duct Clamp, For Nominal Duct Diameter 20 in, Product Type Duct Clamp, Material Thickness 18 ga, Material Steel, Overall Length 20 in, Inside Diameter 20 in, Seal Material Nitrile, Weight 1.92 lb, Shape Round, Standards Not Applicable, Outside Diameter 20 in, Finish Galvanized, Compatible with Series QF, Compatible with Brand Nordfab, Series QF, Maximum Temperature Rating 158 Degrees F