Carmex MT0312C0820UN

Helical Flute Thread Mill: 7/16-20 to 1/2-20, Internal, 3 Flute, 5/16″ Shank Dia, Solid Carbide 20 TPI, 0.276″ Cut Dia, 0.83″ LOC, 2.5″ OAL, TiAlN Coated