Review on Quick Release 1 Inch Barbell Clamps - Locking Collar Clips For Standard Bar Weight Plates - Ideal For Fitness Training, Weightlifting, And Bodybuilding By Greententljs by Jay Mitchell

These fit great on my 1-inch standard non-threaded barbell bar, and haven't had any issues with anything slipping. Weights wobble a bit when I set it up for deadlift, but mostly because I don't push the plates flush against the stop on the bar. And since I'm not tilting the bar to extreme angles in either direction, I'm not putting too much pressure on the clamps. When unloading the last plate from the bar on the floor, I usually undo each clamp just to make sure there isn't any unnecessary pressure on the clamps.I'm guessing not all bars are created equal, and there may be some QA standards that are a bit off from bar to bar, so clamps may fit tighter or looser depending on the bar. But with a CAP non-threaded bar, they've been fine.If you feel uneasy about keeping a bar level, or using heavy plates on a barbell handle, maybe go a threaded route. Also, maybe don't use these on a threaded bar. use the collars that come with it. There's less surface for the clamps to grip on a threaded bar, so of course they'll be a little weaker.