last year I bought this indexable cutter http://www.rdgtools.co.uk/cgi-bin/ss...2309&NOLOGIN=1
and just tried it and its giving a much better finish, downloaded HSMAdvisor trial and for this cutter its giving me low RPM for HSS and very high for Carbide, any idea how to identify if the triangle insert is Carbide or not, all it says its Tin coated, not sure what the other abbreviations are

this is a set of them from same site, for reference http://www.rdgtools.co.uk/acatalog/1...3.html#SID=404


alternatively any recommendations to replace it with a carbide one in case those are not?