20mm Rough-Tech 56 Necked 4FL Fine Tooth Carbide Rougher, Weldon Flat Shank, nano-Si Coated, 38mm LOC, 54mm Reach 38MM LOC,20MM SHANK,104MM OAL ROUGH-TECH 56 / GS 100 H Right Hand 20? Helix, Right Hand Cut, 4 Flute Standard Length, Extended Neck Relief, Center Cutting High Performance Fine Tooth Carbide Rougher, Weldon Flat Shank, .50mm x 45? Corner Chamfer, nano-Si Coated for Ramping and Helical Interpolation Roughing Alloyed Steels, Tool Steels, Cast Iron, Nickel & Titanium Alloys and Hardened Steels to 56 HRc Series 3682 Guhring Part #9036820200000