The thin profile design of these aluminum olympic collars let you load a little more weight on the bar when you're pushing the limits.
The handle is offset from the other half of the clamp to allow room for locking without rubbing the handle up against your plates.
These will hold plates on your bar much better than spring collars. The manufacturer tested them by dropping it with a forklift with 600 lbs on it and the collars only budged a little.
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