20mm Rough-Tech ALU 3FL Necked Coolant Fed, Bright, Weldon Flat, Coarse Carbide Rougher, 32mm LOC, 54mm Reach 32MM LOC,20MM SHANK,104MM OAL ROUGH-TECH ALU / GS 100 A Right Hand 30? Helix, Right Hand Cut, Center Cutting High Performance Coolant-Through 3 Flute Standard Length Flutes, Extended Neck Relief Coarse Tooth Carbide Rougher, Weldon Flat Shank, .50mm x 45? Corner Chamfer, Bright Uncoated for ramping and helical interpolation roughing aluminum, aluminum alloys, brass, bronze, copper, magnesium and plastic. Series 3364 Guhring Part #9033640200000