They’re usually made of flexible rubber and come in different sizes like this. Common uses include: Protecting cables or wires where they pass through metal or plastic holes Sealing unused holes in panels, boxes, or enclosures Vibration and abrasion protection in automotive, electrical, or DIY projects If the center is solid (not a hole), they’re often called rubber blanking plugs or snap-in hole plugs. If there’s a hole through the middle, they’re classic grommets.
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