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+1 @Mickie_Cricket, if there's no bracing of that unit above or below then those tiny flanges won't hold it regardless of what you fix it with.
ffm-
Not necessarily, that's keyklamp or something similar, the flanges are solid and as a system it's designed for handrails etc. If you're really after a solid fixing then expanding bolts or threaded bar with chemfix (properly applied) will hold it very solidly (chin up bar solid). If all 4 holes in the flanges have proper fixings with good screws and heavy duty plugs then it should hold.
Bobbo
i would say that attaching that, plus the weight of the wood and whatever the shelves, rail and hook need to hold are beyond the capacity of fasteners that fit in those flanges (flanges are the circular flat bits with the screw holes in).
i think you would need some kind of bracing below. angled pieces supporting the shelf from below.
just read back @ffm comment and basically the same thing lol