it about never needs sharpening, the one I use hammered forever like a razor blade before it got a light lick on the stone .
I bought about 6 or 8 of them back when and gave a few away and the others are still in my garage brand new ....
they were only 3.99 when I bought them, and I am still using the very first one I got to try out to see if it was any good....
when I held the first one and touched the blade, I thought it's holy you know what SHARP , now if it will just hold that edge is the next question