TM-180-8 Thread Milling Cutter - UN, 18-56 Thread Size, 180 Cutter Dia, 1/2 Neck Length, 090 Neck Dia, 0015 Flat, 180 Cutter Dia, 4 Fl, 1/4 Shank Dia, 2-1/2 OAL, Uncoated TM-250-18X Thread Milling Cutter - UN, 16-48 Thread Size, 1/4 Cutter Dia, 1-1/8 Neck Length, 150 Neck Dia, 0015 Flat, 1/4 Cutter Dia, 4 Fl, 1/4 Shank Dia, 2-1/2 OAL, AlTiN