Snap-On Collar, Material Steel, Product Type Snap-On Collar, For Nominal Duct Diameter 6 in, Thickness Not Applicable, Overall Diameter 5 3/4 in, Compatible with Product Type Fiberglass Back Diffusers, End Type Bend Tabs, Overall Height 4 in, Compatible with Grainger Part Number Fiberglass Back Diffusers, Shape Round, Finish Galvanized