I’m using these to store barbells as part of my DIY vertical hanging storage. You definitely need the 5” size to fit barbells. The official weight rating is only 33lb but that’s assuming the weight is all the way out on the end of the hook, but with the barbell up against the base it is plenty strong enough to even support the 65lb SSB.
One thing I needed to do was make up a “clamp” to keep the U hook closed on the SSB due to the construction of the SSB collar to prevent it from spreading the U hook
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