Here is a link to J & R Engineering for carbide checkering cutters. http://gis.net/~doiron/index.shtml. got some about a year and a half ago. Had to wait a while, he doesn't answer his phone. Finally sent my order on his link. It seems he waits for several orders before he sets up a production run. But they sure are better then high speed steel ones. I hope that this helps you out.