V-Anvil Micrometer Measure Diameter of 3 Fluted Tools Such as Taps, Reamers and End Mills. Features Include... 0.093" - 1.00" Measuring Range 0.001" Graduations 0.00016" Accuracy 3 Flutes 0.250" Spindle Diameter Carbide tipped measuring faces Forged steel frame with enamel finish Ratchet thimble Spindle Lock Certificate of calibration Furnished in fitted case