End Mill Sharpener | End Mill Tool of Universal Grinder. This is a tool using on Grinder for grinding end mill. This accessory noly siuts our grinder. Not for R8 Grinder. 1 Accessory.end sharpener tool,Cuttermaster End Mill Sharpener - ARTCO - American Rotary Tools .Control quality, delivery, and eliminate costly down time by sharpening end mills and other tooling in-house. Reduce your tool crib inventory, and save money.