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Product Description Speedi-Products Galvanized Metal duct strap for use in hanging branch line duct systems. Hang flexible duct, round pipe or rectangular duct. Helps prevent the duct system from sagging over long runs. Attach with sheet metal screws or nails (not included). From the Manufacturer Speedi-Products Galvanized Metal duct strap for use in hanging branch line duct systems. Hang flexible duct, round pipe or rectangular duct. Helps prevent the duct system from sagging over long runs. Attach with sheet metal screws or nails (not included).