EVOLUTION CORE CUTTER HSS LONG - 21 MM

A higher RC rating without brittleness means more holes drilled per pass.

Evolution endmills are guaranteed to outperform other endmills made from HSS, Cobalt or Tini coated materials.

This is because Evolution Premium endmills are heat-treated to 68 RC compared to Cobalt endmills to 66 RC and other brands of HSS endmills to 64 RC.

This makes them much harder than other brands of endmills.

The Tini coating increases the cost of manufacturing the end mill, but only improves appearance and not performance.