Precise Interchangeable Anvil Thread Micrometer 3-4"

Direct reading of pitch diameter in threads 7-11, 12-18, 20-28, 30-44, 48-64, 20-28, 30-44, 48-64 TPI with interchangeable anvil and spindle pairs.
Ratchet stop.
Fitted case.
Micro fine slant line graduations.
Anvils and spindles made of tool steel, hardened and ground.
Kit includes Screw Thread Micrometer and 5 pairs of anvils & spindles.