20mm 4FL Rough-Tech 48 Necked Fine Carbide Coolant-Fed Rougher, Weldon Flat, Firex Coated, 38mm LOC, 54mm Reach 38MM LOC,20MM SHANK,104MM OAL ROUGH-TECH 48 / GS 100 U Right Hand 30? Helix, Right Hand Cut, Coolant-Through 4 Flute Standard Length Center Cutting High Performance Fine Tooth Carbide Rougher, Weldon Flat Shank, .50mm x 45? Corner Chamfer, Firex Coated for Ramping and Helical Interpolation Roughing All General Steels to 48 HRc, High-Alloyed Steels, Titanium & Nickel Alloys. Series 3365 Guhring Part #9033650200000