Speedi-Collar SC-10D 10-Inch Diameter Take Off Start Collar with Damper for Hvac Duct Work Connections Speedi-Collar is made in the USA Saves time, labor, energy, and money with all the innovations Speedi-Collar has to offer The damper ratchet system allows you to adjust the damper into 6 different positions for optimal balancing Speedi-Collar features an integral gasket, a -Inch wide flange and quick-zips for an air-tight connection Speedi-Collar is molded from high density, UV resistant resin making it durable, lightweight, dent and rust-proof