HHIP 7/8 X 3/4 X 1-7/8 X 4-1/8" 5 Flute M42 Cobalt Fine-Pitch Roughing End Mill Cutting diameter is 7/8". Shank diameter is 3/4". Cutting length is 1-7/8". Overall length is 4-1/8". Ground From Solid M42 Blank. 8% cobalt. Center cutting. Low co-efficient friction. The pressure of the cut is distributed over many teeth. Recommended for high production milling in difficult-to-machine materials such as inconel, hasteloy, titanium alloys and other materials up to RC 40. With a Weldon flat, a flat section on the tool shank, used to hold the tool in place by set screws within the body of the holder.