Eccentric Relief is a positive arched cutting edge: a convex surface vs. a concave (hollow ground) surface.  An eccentric relief increases the strength of an end mill's cutting edges.

In this age of advanced technology, with CNC machines being able to run at greater speeds and feeds, it is necessary to utilize cutting tools that are able to run at increased operating parameters.  CGS Storm Series Hi-Helix End Mills are ideally suited for High Performance CNC milling.