Are those turn locks made of composite plastic?
Sure looks like it. That’s an awful design if so. 
Hi there. These are being obtained from Amazon inventory so we don’t have a lot of information. Here it is on Amazon. There may be more information there.
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Per the reviews, the bars are indeed plastic. 
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Thank you, I noticed that as well. Imagine doing an overhead press and having one of those snap on you. Oof!
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