Why are there ridges on the sides of a dust pan?

Question:I noticed this while I was cleaning at work. There are ridges on both sides of the counter dust pan we use. Me and a co-worker weren't sure if it was there for no reason, but I noticed it on other dust pans.

Answers:
The ridges on a dust pan are put there to make the pan stronger, more ridged, less flexible, so it doesn't break so easily.

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It's to use the broom on after you've swept... it will knock off any particles or hairs or whatever stuck to the broom...

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