RELIABILT Duct Straps are built for the professional HVAC contractor in mind. RELIABILT Duct Straps are constructed of strong nylon that provide industry-leading strength (180 lbs. tensile strength) and flame resistance for those tough job-site installations. These cable ties are UL 181 B-C listed for flex duct installation. They are also UL AH-2 approved and plenum rated making them ideal for heating, ventilation and air conditioning systems. RELIABILT Duct Straps are available in 24-in, 36-in and 48-in lengths. Cable Tie Length: 24-in Usage: Indoor only Tensile strength: 180 lbs Pack size: 25 UL type: UL 181 B-C (for flex duct installation), UL AH-2 (for plenum spaces) Plenum Rated: Yes Material Flame Rating: UL 94 V-2 Minimum bundle diameter: 0.28-in, Maximum bundle diameter: 7.15-in Color/Finish Family: White Type: Zip ties Length (Inches): 24 Multiple Sizes: No Weight Rating (lbs.): 180 Material: Nylon Mountable: No Package Quantity: 25 Releasable/Reusable: No UV Protection: No Warranty: None CA Residents: Prop 65 Warning(s): Yes UNSPSC: 39121700