So did I, for $9.99. Grate surface (exfoliating) was dull after 3 extended uses.

Today I bought a (cheese?) grater (that is shaped like a paddle for bringing grater TO the item) for $7.00 Used it and felt grate I mean GREAT. Take care not to abrade but these stainless blades won’t be dull for a good while, I expect.

I looked for but did not find an even finer one for lemon zest, for example. The one I have has holes smaller than the basic old-tyme 4-sided style.
Used over a towel for the skin dust or I may devise a backing with clear wrap or card board w/ tape.