EirCore GripNut™ — Stripped Screw Hole Repair Anchors
EirCore GripNut™ — Stripped Screw Hole Repair Anchors
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The screw spins. Bigger won't help.
GripNut puts a real thread back.
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One screwdriver · 60 seconds
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Nothing to reach behind the panel
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Fits the 5/16" hole already in your car
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Leaves a reusable M4 thread — undo it and use it again
Choose your pack
Free tracked shipping worldwide. Struck prices are the same count bought as 20-packs.
See It in Action
Real repairs on real cars — tap for sound
Between 20 and 300 anchors depending on the pack you choose, each with a matching M4 screw.
No setting tool is needed — the supplied screw sets the anchor.
Size: M4 × 20
Thread: M4
Body: 8 mm diameter × 16 mm long
Overall length: 20 mm
Drill size: 8 mm
Panel thickness: 0–5 mm
Material: zinc-plated carbon steel
Manufacturer rating: 10 kg (22 lb) per anchor in suitable material
Not for plasterboard — standard US drywall is 12.7 mm, far too thick for this extra-short body.
Free shipping worldwide, no minimum. Processed in 1–2 business days. Most orders arrive in 10–18 days; you get a tracking link by email.
30-day money-back guarantee from delivery. See the Refund Policy in the footer for the full terms.
30-Day Money-Back GuaranteeIf the anchors do not hold the repair, email us within 30 days of delivery for a full refund.
A stripped hole does not get better on its own
The screw turns and turns and never tightens. Somewhere behind that panel the hole stopped being a hole and became a slot. What you do about it comes down to three choices.
| What matters | Bigger screw | Pop rivet | GripNut |
|---|---|---|---|
| Holds in a hole that is already torn | No | Yes | Yes |
| The screw comes back out, as often as you like | Yes | No | Yes |
| Leaves a reusable thread behind | No | No | Yes |
| What you need to fit it | Screwdriver | Rivet gun | Screwdriver |
| Load spreads across the panel, not one torn edge | No | Yes | Yes |
A pop rivet holds well, but it is one-way: to get the panel off again you drill the rivet out and start over. None of this means the panel is scrap — it means the hole needs a thread put back into it, not a bigger screw forced through.
Four steps, no special tools
About a minute a hole. A hole that has torn out is usually 8 mm already, so most of the time it is a screwdriver and nothing else — no rivet gun, no welding, and never a hand behind the panel.
⏱ Set the anchor with the supplied screw first, then swap in the screw your part needs. Setting it against the part itself can leave the anchor spinning.
Where a torn-out hole usually is
One hour at a body shop
Body-shop labour: US national average posted rate, National AutoBody Research, July 2026. Anchor price is the 20-pack rate — every larger pack costs less per anchor.
Frequently Asked Questions
Will these work in drywall?
No. This is the extra-short version, made for material 0–5 mm thick. Standard US drywall is 12.7 mm (1/2"), far too thick for the body to fold in behind. Use a drywall-rated anchor for plasterboard.
What size hole do I drill?
8 mm — that is the body diameter. A hole that has already torn out is usually close to it, so most of the time you are just cleaning it up round.
What screw do they take?
M4. Matching screws are included. Any M4 machine screw of the right length works after that.
How much will one hold?
The manufacturer rates each anchor to 10 kg (22 lb) in suitable material. In thin plastic or a 3 mm door skin the panel gives up long before the anchor does — spread the load over two or three anchors for anything that matters.
Can I take it back out?
The screw, yes — as often as you like; that is the whole point. The anchor body stays set in the panel. To remove it completely, drill out the flange.
Will it survive vibration and car washes?
A set anchor is mechanically clamped to the panel, so it does not back out the way a self-tapper does. Use threadlocker on the screw for anything that lives under the car.
The anchors are zinc-plated carbon steel, so the plating resists corrosion. It is plated steel rather than stainless, so under a car it will meet road salt like any other plated fastener — fine for the job, but not a marine-grade part.
How is this different from your EZ-Lock clips?
EZ-Lock replaces a missing clip in a hole that is still good. GripNut is for when the hole itself is wrecked and no clip will bite any more. Most people end up keeping both in the boot.
Fix the hole, not the whole panel.
Pick your pack below. Free tracked shipping worldwide, covered by a 30-day money-back guarantee.
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