The APET's and APKT's are both parallelograms but the APKT's have a helical edge. There are a lot of private label versions out there now that some of Iscar's Patents have expired.
They're so cheap it's worth having both molded and sharp versions.
The 3/4" 3-flute version is ideal for a B'Port. If a decent radial DOC is used they can be very smooth as 2 inserts in the cut eliminates a lot of the "banging".
You'll throw that old TPG import cutter in the garbage after using one of these for the first time.

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