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Provide great protection for the bar with the full length liners. Are more stable sitting in the cups than the standard ones. I like that they swing opposite. There was a large gap on mine between the uprights and sat loose. Since I leave them at the same position for squats, I stuffed plastic shims on the back: locked in place.
These are well made, robust J-hooks for the X-3 power racks and squat stands. They're more stout that the (more than adequate) standard J-hooks that came with my X-3 squat stand. I like that these new sandwich J-hooks are opposite-handed and swing in opposite directions; the standard X-3 J-hooks are same-handed and both swing the same direction. J-hooks swinging in opposite directions add a touch more stability to the racked bar and better accommodate cambered (arched) bars.