It's a HarborFright "joiner" blade ... around ten bucks as I remember. Made a shaft to mount it in a boring bar holder. Drilled index holes in it to pin it to keep from being rotated down. Been using as necessary for a year now and broke one of the carbides out cutting off a tube (too thin wall). I think you could use an even thinner blade as it is quite stiff with all the matal supporting it.
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