I just bought one of these indexible endmills.
http://www.use-enco.com/CGI/INSRIT?PMAKA=324-0105

It uses the following inserts:

TPG/TPU/TPC-321,2

Looks like 6 choices. What is the difference among them, and which ones
should I buy? I expect to use this for surfacing mild steel and
aluminum. But I have yet to use this minimill so I don't know what I
will end up doing with it
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Rex Burkheimer
WM Automotive
Fort Worth TX