C style 80 Degree Diamond Shape

This guideline should be taken only as a general rule of thumb - Of coarse there are always exceptions to the standard{s} the industry has designated

"C" Style Carbide Insert =  diamond shaped insert  with a 80 Degree Nose Angle, traditionally used in some form of a boring or turning application

This insert also offers a 100 degree edge, it does not have the popularity of the 80 degree corner - yet many of the folks I have dealt with will purchase the 100 degree angle indexable toolholder - keep some of the inserts and use it mainly on a facing operation.
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CPMT-32.52MF Carbide Insert Kennametal Grade KC9225
Boring - Turning KC9225 grade has been specially designed for resisting depth-of-cut notching and minimizing burr formation often observed in the machining of austenitic stainless steels. Cobalt-enrichment provides an optimum combination of toughness and deformation resistance. This new grade’s polished edge minimizes build-up and ensures superior workpiece finishes. KC9225 inserts are your first choice for machining stainless steels. TiN; TiCN; Al2O3; TiN
$4.50

CPMT-32.52MF Carbide Insert Kennametal Grade KC9225 (Carbide Boring Turning Insert)

Boring - Turning KC9225 grade has been specially designed for resisting depth-of-cut notching and minimizing burr formation often observed in the machining of austenitic stainless steels. Cobalt-enrichment provides an optimum combination of toughness and deformation resistance. This new grade’s polished edge minimizes build-up and ensures superior workpiece finishes. KC9225 inserts are your first choice for machining stainless steels. TiN; TiCN; Al2O3; TiN
$4.50