Honestly, I never knew these things existed until I did a search for spring clips on Amazon. Since I am not familiar with these I bought a pair to try out and I purchased a pair of the old trusty spring clips. I have not used the spring clips once. Old antiquated trash. These are cheaper and superior in form and function. This is the wave of the weight securing clamp future right here. So much easier to get on the bar and provides a tighter grip.I know that them being made out of plastic may be a cause for concern for some, as it was for me. I assure you that these are rock solid. I put two 45lb plates on the end of a barbell and lifted it by the clamp. The clamp did not budge a millimeter. I really love these clamps.

Functional but came defective. One clamp was missing all four screws. They weren't in the packaging either, just didn't get put in during manufacturing. I used some 1 1/4" Sheetrock screws and it works but the clamp cracked on first use. You get what you pay for.

I've been using these for the last week on a new Rogue powerlifting bar I bought at the same time. To date I've used the large squeeze weight retaining clamps, but when I squat enough weight to bend the bar those squeeze clamps gradually slide out. When they slide out enough, the bar becomes unbalanced which is not only super annoying, it has the potential to lead to injury to me or to bystanders if the bar became enough unbalanced that the weights were to slide off the end (that's not happened in years, but it has happened).

Once these clamps are secured, they are locked down. Keep in mind they are plastic, so while they've held up great for the last week, I suspect if dropped repeatedly they might not hold up (that's a guess, not an observation), but since they're not insanely expensive, I think that's more than acceptable. I plan to pick up a few more pairs, once I get all my Xmas bills paid off. :)

In any event, these are really easy to secure and to break loose, in fact I'd personally say they're easier to work with than the squeeze clamps, and I've found them to be far superior in their grip strength.

Fell apart on the first day. Perhaps it was supposed to be screwed together and they forgot. Either way it's junk.

I have used "muscle clamps" originals for years, saw these on Amazon at a ridiculously low price and in PINK....it was a no-brainer. Ordered them, received quickly, super durable, color is amazing, fits Olympic size bar and I could go on and on....I liked them so much I bought several other pairs to share with a few of my dedicated fellow gym goers and they love them! I mean really, who wants to go searching for collars in the gym and then having to squeeze the living crap out of them to get em' to open? Not me, I'm female, I'm impatient, and like the ease of these collars - no problems EVER and they are "pretty" especially when the bar is loaded up to lift like Tarzan but the collars say Jane!