Cambridge Resources has custom engineered state-of-the-art extruding technology to weave the very finest quality Support Webbing that meets or exceeds every industry standard. Cambridge’s 1.75" Support Webbing registers a remarkable tensile strength of up to 440 lbs. Nylon webbing duct support strap. Use to hang HVAC duct. 440 lb. average tensile strength. 1.75" x 50 foot roll.