4mm Trace-Tech 4FL Torus Grind Hard Profile Cutter, Plain Shank, Carbide nano-Si Coated, 13.4mm Reach, .50mm Radius 6MM LOC,6MM SHANK,57MM OAL TRACE-TECH / GF 300 T 4 Flute Right Hand 30? Helix, Right Hand Cut, Extended Neck Relief, Standard Length, Torus Grind, Plain Cylindrical Shank, Center Cutting Carbide Hard Profile Cutter, nano-Si Coated. For precision contouring and die & mold work. Performs roughing, finishing, ramping, helical interpolation and copy milling in cast iron, steels and hardened steels to 62 HRc, with 0.50mm Radius Series 3361 Guhring Part #9033610040000