4mm Diver 4FL Variable Helix Necked Carbide End Mill, Plain Cylindrical Shank, Nano-Si Coated, 8mm LOC, 15mm Reach 8MM LOC,6MM SHANK,54MM OAL RF 100 Diver 4 Flute Right Hand 36?/38?/37?/38? Variable Helix, Right Hand Cut, Plain Cylindrical Shank, Extended Neck Relief Center Cutting Carbide End Mill with .04mm x 45? Corner Chamfer for High Performance Ramping, Slotting, Plunging, Helical Interpolation Roughing & Finishing Steel, Stainless Steel, Cast Iron, Nickel/Titanium Alloys & Aluminum Series 6803 Guhring Part #9068030040000