8mm 4 Flute Ball Nose 30? Helix Carbide End Mill, 20mm LOC, 8mm Shank, 63mm OAL, Bright Finish 20mm LOC,8mm SHANK,63mm OAL Ultra-Tool? Series 320B 4 Flute Ball Nose Standard Length Carbide End Mill. 30? Right Hand Helix, Right Hand Cut. The industry?s best value in a general purpose design. These end mills are more than capable of handling 75% of milling applications due to robust geometry, quality craftsmanship, and best-in-class Ultra-Grain? carbide substrate. Most importantly, these end mills benefit from the Tool Alliance? duo of proprietary & value-added features: SmoothGrind? & SmoothContricity?. Ultra-Tool? USA Part #32174