Question 1

Will these plugs fit my exact 3mm or 1/8-inch hole?**

Accepted Answer

They are designed for holes between 3-3.3mm (0.12-0.13"). Many users find they fit standard 3mm holes perfectly, creating a snug, sealed fit. However, a small number of DIYers on forums have noted that if your hole is at the very bottom of that range or made from a soft material, insertion can be tight. For absolute precision in a critical application, testing one plug first is recommended.

Question 2

Are they easy to install and remove?**

Accepted Answer

The rubber is durable and provides a great seal, but it is firm rather than super soft. As mentioned in several project videos, you'll likely need to push firmly to seat them fully. This stiffness is what makes them effective for vibration damping. They can be removed with a pin or small tweezers if needed.

Question 3

What are they made of, and are they durable?**

Accepted Answer

They are made from black synthetic rubber. Reviews consistently praise their durability for indoor use, noting they hold their shape and seal well over time without crumbling or losing elasticity. They are not advertised as silicone, so they are best for mechanical/DIY applications, not for high-heat or food-related uses.

Question 4

What do people typically use these for? Are they right for my project?**

Accepted Answer

These are hugely popular in DIY communities for sealing unused screw holes in metal or plastic, dampening vibrations in computer cases or audio equipment, and plugging ends of tubes or handles. They're ideal for tinkerers, modders, and anyone with a box of "small things to fix." If you need a perfectly clear, medical-grade, or extremely flexible silicone plug, you might want to look for a specialized alternative.

Question 5

What should I know about the value and what comes in the package?**

Accepted Answer

You receive 16 plugs in a simple, resealable plastic bag—no fancy case. The overwhelming sentiment is that for the price, the quantity and quality offer excellent value for solving numerous small jobs. Just be aware of the pack size and have a small container ready to keep them organized after opening.

uxcell 16 Pieces Black Rubber Stopper, 3.5mm Plug Holes for 3-3.3mm/0.12-0.13" Hole

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