Do not buy these they are awful!! Does not fit anything. Sometimes they are returns that are stripped. When you get a replacement they send you back the same ones. Or one would be missing. Size doesn’t even matter. One would be loose one wouldn’t even go on.

these become loose all the time, how to fix?

Personally, I just figured you needed to check them/tighten them every time you picked up the bar, but I suppose that if you bought an extra pair and added a pair to the outside of the set you have, that would slow down if not reduce the amount they loosen?

is the product made of iron?

The product is made of metal. I am unable to say if it is iron or some other alloy.

2pcs Anti Slip Hex Nut 25mm Collar Screw For Barbell

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔩 Lock in your lift, silence the noise, own the gym.

PERFECT PAIR - Includes 2 precision-engineered collars—never worry about your weights slipping mid-set.
SILENT STRENGTH - Anti-skid gasket minimizes clanking noise—train hard without the distraction.
SECURE YOUR GAINS - Spinlock collars engineered for a rock-solid grip on any 25mm barbell or dumbbell.
EFFORTLESS ADJUSTMENT - Smooth threading for quick, reliable tightening and loosening between exercises.
DURABILITY MEETS STYLE - Sleek silver alloy steel finish that’s as tough as your workout routine.

The Lamoutor 2Pcs Anti-Slip Hex Nut collars are precision-crafted from durable alloy steel to fit all 25mm standard weightlifting bars. Featuring an anti-skid silent gasket, these silver spinlock collars ensure a secure, noise-reduced grip on your dumbbells and barbells. Ideal as reliable replacements or upgrades, they come in a convenient 2-piece pack designed for easy adjustment and long-lasting performance.

Specifications

ASIN	B08H8Q763L
Best Sellers Rank	#122,547 in Sporting Goods ( See Top 100 in Sporting Goods ) #76 in Exercise Collars
Brand Name	Lamoutor
Color	Silver 2pcs
Customer Reviews	4.0 4.0 out of 5 stars (523)
Handle Diameter	25 month
Handle Material	Alloy Steel
Item Weight	0.31 Kilograms
Manufacturer	Lamoutor
Material	Alloy Steel
Number of Pieces	2
Other Special Features of the Product	No-Roll Head
Style	Adjustable
Target Use Body Part	Whole Body
UPC	711731030098

Reviews

S**E

One threaded collar worked. The other had the wrong threading and would not go on my bar. Returned.

1.02.2024

L**E

Son un poco mas delgadas de lo que esperaba pero al menos cumplen su función de manera adecuada

6.07.2025

J**A

Excelente

8.02.2023

C**E

Excellent fit. No issues with the quality at all. I'm sure some people got unlucky, but it looks like some others ordered the wrong size on accident. Just double-check the diameter of your bar and make sure you selected the right size before checking out.

5.11.2025

D**N

Honestly I never really write reviews on Amazon if I ever have an issue I just return the item but after not one but two whole sets that I ordered for my curl bar all four do not thread! This has been one of the worst purchases that I've bought on Amazon in a very very long time Do yourself a favor if you need to buy these things just pay that little extra money and go to an actual store because these are garbage.

14.10.2025

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Ravi S.

I loved the variety of products available. Will definitely shop again.

2 months ago

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