FR: Ils sont faciles à fermer, agrippent bien la barre et maintiennent des poids très lourds en place. Malgré leur apparence bon marché, ils sont très solides parce que j'ai accidentellement fait tomber un disque de 20kg dessus, sans le moindre dégât sur le produit. Avant de les avoir, je n'utilisais jamais de stop disques (j'avais le modèle traditionnel en ressort) parce que c'était trop pénible, mais maintenant c'est tellement rapide et facile que c'est automatique sans y penser. EN: They're easy to lock, grip the bar well, and hold heavy plated. Despite their cheap plasticky appearance, they're very strong: I accidentally dropped a 20kg (45lbs) plate on one of them, and there's no damage. Before having those, I never used my collars (traditional model) because it was too annoying to put on, but those are so easy that I do it without thinking.
I bought a used Olympic weight set a few days ago, and it came with spring clamps. Maybe because my barbell sleeve is 50 mm in diameter, and the spring clamps are 2" (which is a slightly different size), but the clamps sucked. They would not keep the weights in place, as they just kept moving around. This was a big issue for me, as I do power cleans and power snatches, which require the weight to be moved quite rapidly. On the first day of working out, the spring clamps gave way, and the weight on the barbell flew off, luckily missing the plasma TV in the basement, where I work out. I went ahead and ordered these immediately, and with Prime, the shipping was free, and the lock jaw clams were actually delivered the next day (less than 18 hours later). These work way better than the old clamps, as the weight is secure, and I can fling the barbell about freely, without worrying about the TV and the game consoles located a few feet away. The clamps feel heavy duty to me, and doesn't feel like they would snap off any time soon. I would still buy a replacement, if any of them break.
Simple to use and so convenient for a woman's smaller hands. I'm happy to cut off a few seconds here and there for my workout because now I don't have to struggle with the spring clips. Yay!
Within a week the small latch that holds them together had broken off, quite literally just snapped while attaching them to a 2 inch Olympic barbell. I am someone who always treats gym equipment with respect, so I would not claim they were put through any undue wear and tear. As much as I hate to bash a product, I was not satisfied with their performance and would recommend going for a metal collar for a few dollars more.