bifold door hardware make

A quick learner from closet says:
I am looking at bifold door hardware and I am wondering if some of the hardware is made out of aluminum. Like for example 23-114 , 23-112 , 23-139 , 23-135 , 23-506 . And I am wondering if this piece, 23-312 is made out of some sort of steel or not.
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Paul from SWISCO responded:
Hello! All of the bifold door hardware you mentioned are made of steel.
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