Is it this? Chromium(IV) oxide, 99.5%, 100g - eBay (item 370131742714 end time Jan-15-09 11:46:53 PST)

325 is extremely coarse, and it must be very granular. There's not really a need for something that coarse. The only reason I can think of it being coarser is because it's listed as Chromium (IV) Oxide, Cr02. I found another product of their's: Chromium(III) oxide, Purified, 500g - eBay (item 250321159470 end time Jan-05-09 11:13:44 PST) that refers to Chromium (III) Oxide, Cr2O3. It doesn't list the grit size of this one though....

I'm pretty sure the chromium oxide you want for razor purposes is the Chromium (III) Oxide, Cr2O3.

I hope that's helpful!

Dave