20mm RF100U 3FL Variable Helix Firex Coated Carbide End Mill, Necked, Plain Shank, 38mm LOC, 104mm OAL, 52mm Reach 38MM LOC,20MM SHANK,104MM OAL RF 100 U 3-Flute Right Hand 41?/43?/45 Variable Helix, Right Hand Cut, Plain Cylindrical Shank, Standard Length, Extended Neck Relief, Center Cutting High Performance Carbide End Mill with .15mm x 45? Corner Chamfer, Firex Coated for Roughing, Slotting, Plunging, Ramping and Helical Interpolation in Alloyed Steels & Cast Iron up to 48 HRc. Also Suitable for Titanium / Nickel Alloys and Hardened Steels. Series 3891 Guhring Part #9038910200000