Pencil Sharpener?

Apparently I’m out of the loop but some people grind their pencils against cement flooring to sharpen it so this handy dandy device called the Re-knife makes it a bit easier with a portable stone. One side is rough, the other smooth. Who knew? Would any of you use this?

Designers: Yitu Wang & Joy Zhang

Re-Knife Pencil Knife by Yitu wang & Joy Zhang