Lock-Jaw Barbell CollarsFlex Quick Release Aluminum with Magnet (Grey)

Easy to use. Very durable and are sleek. They don't move at all when you are exercising and so far hold perfectly. I use them 4 times a week and no issues. The magnets are strong so no worries on them falling from that. They locking mechanism is fantastic. I would highly recommend these.

These are around just 60% of the width of a regular collar from the same brand, which is good if you have a short barbell, trap bar, or similar and put wide bumper plates that use a lot of space, you can get away with 10kg more per side (additional 20kg space). They are heavy, and sturdy, very tight and lock/unlock easily. The thing that I did not read is the magnet. It is not on the sides of the collar, it is right opposed to the lock, is a little magnet rectangle, but is very strong so don't worry about that.Overall, a great product.EDIT: just amazing! these fit 1.9" and 2" barbbells, it closes with some effort but opens and clicks into place with a spring mechanism, magnet is strong, I used it with regular bars and specialty bars with no issues, it stays put and tight. at this price this is great, I may buy another pair.

The plates just aren't going to move anymore and that's amazing. Best collars ever, worth every cent.

Purchased these collars a few weeks ago. Have used them in training where athletes twist the bar and the collars keep the plates from moving. I have used the plastic collars and had issues with them sliding and the plates moving. Very pleased with these collars and plan on purchasing more.

Got these primarily for curl bar and they hold great and take half the space of my other collars. They also work on my regular bar bells. Highly recommend for those with short sleeve bars.