Quick view Gripple Butterfly #2 with 3/8in Stud End Fixing (10 per bag) ***FREE GROUND SHIPPING*** ***If you need expedited shipping, please call 855-268-6657*** Designed to improve the installation of plenum boxes and small ductwork in HVAC applications Ideal for applications where space is tight – eg. Plenum... MSRP: Was: Now: $91.60 - $167.40 Choose Options