Best barbell collars money can buy (and the last). During my time as a student athlete at the University of Nebraska, we used these on all of our racks and I never had a plate slide on the bar or any issues. Now that I am training on my own, I use these for not only a regular 2" bar but also for reverse hypers, logs, farmers walk bars etc and never had any issues. Super easy to clean to make them feel good as new. Super great customer service as well. If you're wanting a great quality product that has been around forever, look no further.