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As an aside: what exactly does 'правки' mean?

I thought it derives from a verb 'making right/changing/correcting/editing/rectifying' not unsimilar to German '(ab)richten'. If I'm not mistaken an...

There is some information (in Russian) on a similar hone here.

The box reads:
брусок (brusok, bar/bench stone)
микрокорунд (mikrokorund, aluminium(III)oxide/Al2O3)
для правки бритв (dlya pravki...