This is a dual caddy for the mini desktop dustpan created by Jonathan_K1906: https://www.thingiverse.com/thing:3155842.

I didn't print the scraper from the design, but instead, bought some brushes from a grocery store. The caddy should support brushes with a similar oblong handle.

Since there are no mounting holes/tabs, you can either set this upright or mount it using Command™ strips, like the ones in the picture.