4.5mm Aero-Tech 3 Flute 45? Helix Carbide Plain Shank End Mill Bright Uncoated, 8mm LOC, 22mm Reach 8MM LOC,4.5MM SHANK,50MM OAL AERO-TECH / GH 100 U 3 Flute Standard Length, Right Hand 45? Helix, Right Hand Cut, Plain Cylindrical Shank, Center Cutting Carbide End Mill, .05mm x 45? Corner Chamfer, Bright Uncoated. Optimized flute geometry for ultimate efficiency in slot milling and roughing operations in aluminum, alloyed steels, free cutting steels, tool steels, stainless steels, cast iron, brass, bronze, plastics, special alloys & hardened steels to 54 HRc Series 3203 Guhring Part #9032030045000