7.7mm Diver 4FL Variable Helix Necked Carbide End Mill, Weldon Flat Shank, Nano-Si Coated, 12mm LOC, 20.5mm Reach 12MM LOC,8MM SHANK,58MM OAL RF 100 Diver 4 Flute Right Hand 36?/38?/37?/38? Variable Helix, Right Hand Cut, Weldon Flat Shank, Extended Neck Relief Center Cutting Carbide End Mill with .08mm x 45? Corner Chamfer for High Performance Ramping, Slotting, Plunging, Helical Interpolation Roughing & Finishing Steel, Stainless Steel, Cast Iron, Nickel/Titanium Alloys & Aluminum Series 6804 Guhring Part #9068040077000