5mm 4 Flute w/0.50mm Radius 30? Helix Carbide End Mill, 16mm LOC, 5mm Shank, 50mm OAL, Bright Finish 16mm LOC,5mm SHANK,50mm OAL Ultra-Tool? Series 320R 4 Flute Corner Radius 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 #31233