How do I grind the bit for my circle cutter?

Thank you RJ, the grind on the bit you posted looks like the trepanning cutter I found picture of online. wasn't sure it would cut the 1/4" thin plywood efficiently ( thought it might dig into the plywood too much) so I passed on it , I could grind one end of the bit that way to compare with the one Mike mentioned.
Thanks for your suggestion and the pics.
 
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