Uxcell 12" Duct Connector Flange 2pcs Dryer Vent Wall Plate Square to Round with Clamp for Air Cooling Ventilation Black

Outer Diameter of Top Interface: 285mm / 11.22 inch Outer Diameter of Bottom Interface: 298mm / 11.73 inch Fit for Ducting Hose with Inner Diameter: 12 Inch Overall Dimensions: 330x330x80 mm / 12.99x12.99x3.15 inch (L*W*H) Diagonal Mounting Hole Distance: 350mm / 13.78 inch Adjacent Mounting Holes Distance: 250mm / 9.84 inch Screw Mounting Hole: 5mm / 0.2 inch Packing List: 2 x Duct Connector Flange, 2 x Duct Hose Clamp