Mitutoyo Screw Thread Micrometer Interchangeable Anvil Type Micrometer Specifications include... 5-6" Measuring Range 0.001" Graduations + 0.00025" Accuracy Features include... For use with 55?ø or 60?ø interchangeable anvils Ratchet Stop Supplied in fitted case Interchangeable Anvils Sold Separately 55?ø Anvils: # 126-810 60?ø Anvils: # 126-800