What Are the U Shaped Cutouts on a PC Case For?

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The "U" shaped cutouts on PC cases serve a practical purpose by providing a safe edge for users when accessing the internal components. These cutouts often feature rubber or plastic coverings to protect against sharp metal edges, minimizing the risk of cuts or scratches during maintenance or upgrades. The raised circles found within the "U" shapes are typically part of the design to enhance structural integrity or support cable management, although their specific function can vary by case design. Overall, these features contribute to user safety and improve the overall experience of working inside a PC case.
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"U" shaped cutouts on a PC Case

I'm asssuming most people have opened a PC case at some point.

What are the "U" shaped cutouts lining the edge-flanges of the case there for?
There are also curious little raised circles on the inner part of the "U" shapes. I've always noticed them but I've never known what they actually do.

Does anyone know?
 
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If you mean the rubber or plastic material used to cover the internal edges of the case, it's because those metal edges are sharp, and those edge covers prevent people from getting cut or scratched when working on stuff inside the case.
 
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