Diversitech Hanging Duct Strap, 400 to 460 lb, 100 yd Length, 1-3/4 in W, For Use With: Flexible Ducting, Polypropylene Woven, Black, Import
Webbed duct strap processing high tensile and abrasion resistance. This can be used for flex duct as it is easy to cut and staple to joists. The product is chemical resistant and listed to spec 2043.