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3.5mm 4 Flute Ball Nose 30? Helix Carbide End Mill, 12mm LOC, 4mm Shank, 50mm OAL, Bright Finish 12mm LOC,4mm SHANK,50mm 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 #32165