0-1 " Screw Thread Micrometer Kit 0.001 Graduation Anvils #1-5 Direct reading of pitch diameter in threads with interchangeable anvil and spindle pairs. Anvils and spindles made of tool steel, hardened and ground. Micro fine slant line graduations. with fitted case. Anvil #1 Pitch TPI: 64-48, Anvil #2 Pitch TPI: 44-28, Anvil #3 Pitch TPI: 24-14, Anvil #4 Pitch TPI: 13-9, Anvil #5 Pitch TPI: 8-5.