Push-in Round Plastic Plug
Fits 5/16" Hole ID, 3/8" Head Diameter, Black
Ten pieces as shown in photograph.

Commonly used to plug holes in sheet metal, just press them in a hole—they have strips on the sides that expand beyond the hole diameter to lock into place. All are made of nylon. Rockwell hardness is R118. Maximum temperature is 250° F.

Fits ID5/16"
Fits Panel Thickness 0.016"-0.062"
Head Diameter 3/8"
Additional SpecificationsStandard

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I also sell ASSORTMENT packs with a variety of different sized plugs.  Please see my other auctions.