Hillman 0.5625-in Black Polychloroprene Hole Plug in the Hole Plugs department at

Tnisesm 135Pcs 8 Sizes Nylon Plastic Hole Plugs Black 1/4 5/16 3/8 1/2 5/8 3/4 7/8 1 Round Drill Hole, Flush Type Panel Knockout Locking Plugs, Furniture Cabinet Insert End Caps:

Hole Plugs at

Hillman 2-Pack 1-in White Plastic Hole Plug in the Hole Plugs department at

Hillman Black Nylon Hole Plug (Fits 1/2 Hole) : Industrial & Scientific

The Hillman Group 943343 Chrome Hole Plugs, 5/16-Inch , 5-Pack : Industrial & Scientific

The Hillman Group 58133 9/16-Inch Black Nylon Hole Plug, 15-Pack : Industrial & Scientific

Hardware Higginbotham Brothers

Kreg 50-Pack 0.375-in Multiple Colors/Finishes Wood Hole Plug in the Hole Plugs department at

Hillman Black Nylon Hole Plug (Fits 1/2 Hole) : Industrial & Scientific