Precision Ground Insert has 3F geometry.
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Press Release Summary:

Original Press Release:
Stellram Introduces New Insert With 3F Geometry For Aerospace Applications
Stellram now offers a new precision ground insert with a geometry for stainless steels, aluminum, high temperature alloys and steels. The new 3F geometry is ideal for
aerospace applications where high accuracy is required.
Advantages of the new insert include:
* Periphery ground edges for high accuracy profiling and
excellent indexability
* Light hones and positive geometry for reduced built-up
edge and improved surface finish
* Small radii available for light depths of cut and for
producing small corner radii
* New PVD grades offer layer of lubricity for reduced
coefficient of friction plus extended wear
* New coating also improves heat resistance and optimizes
chip flow