3 1/2" 3.5 inch Flush Mount Black Plastic Body and Sheet Metal Hole Plug Qty 5 (Pack of 5) 3 1/2" ID 3.5 inch Hole Plugs Flush Mount Black Plastic Body and Sheet Metal Plugs | Out Side Head Dia 3.7/8", for Panel Thickness 0.03"-0.11", Height 0.28" | by SBD