4mm RF100S/F90? 5FL 45? Helix Plain Cylindrical Shank Necked nano-A Coated Carbide End Mill, 12mm LOC, 26mm Reach 12MM LOC,6MM SHANK,65MM OAL RF 100 S/F 90? 5-Flute Right Hand 45? Helix, Right Hand Cut, Plain Cylindrical Shank, Extended Neck Reflief, Extra Long Length, High Performance Center Cutting Carbide End Mill with 90? Sharp Corners, Nano-A Coated for Universal Finishing Materials up to 48 HRc. Series 6763 Guhring Part #9067630040000