I've never heard them called "corn bits" before; did whomever sold them to you refer to them that way? Normally they're called "diamond-cut" or "diamond-pattern" end mills. If you search under that name, you might have better luck. (Here's a chart: https://www.precisebits.com/referenc...tfeedspeed.htm ) But usually they're used for cutting composites, not plywood. I doubt they have enough chip-removal ability to work very well on plywood, unless you're just using them for a finish cut.