Clean Storm 20240517 TurboBrite XL Vacuum Drive Air Duct Cleaner 16 Inch Centering Support Ring For use with the 2" extra large version of the Turbobrite Air duct cleaner. Will not work with the 1.5" version. 16" OD X 46mm Bore X 3" Hub Does not turn or spin but rather helps lift the tool body off the bottom of the air duct during the cleaning action.