20mm Diver 4FL Coolant-Thru Necked Carbide End Mill, Plain Cylindrical Shank, Nano-Si Coated, 38mm LOC, 52mm Reach 38MM LOC,20MM SHANK,104MM OAL RF 100 Diver 4 Flute Right Hand 36?/38?/37?/38? Variable Helix, Right Hand Cut, Coolant-Through, Plain Cylindrical Shank Extended Neck Relief Center Cutting Carbide End Mill with .20mm x 45? Corner Chamfer for High Performance Ramping, Slotting, Plunging, Helical Interpolation Roughing & Finishing Steel, Stainless Steel, Cast Iron, Nickel/Titanium Alloys & Aluminum Series 6801 Guhring Part #9068010200000