5/16" Black Nylon Plastic Flush Head Hole Plugs HPN-033 (18 pcs.)

Diameter: 5/16"
Diameter 2: 3/8"
Thickness: .32"
Material: Nylon
Finish: Black
Head Style: Flush
Type: Hole Plug
Application: 5/16" hole

Box of 18.

Hole plugs are used to cover a hole to prevent debris from entering.