Spring Collars are the go to for a quick and simple collar solution at a low price. These are strong collars that are tight on the bar. Chrome plating keeps them looking good. Fits barbells with 2" sleeve diameter.
Good strong collar
These clamps are good. I would guess they have about three times as much metal in them as the cheap clamps I got from Sears (and at $10 a pair, these are pretty cheap themselves). I think they are great. My wife thinks they are too stiff. They are also large so she uses two hands to put them on.