Mitutoyo Digimatic V-Anvil Micrometers Series 314Precision is our Profession Mitutoyo Digimatic V Anvil Micrometers Series 314 Measures the outside diameter of cutting tools (such as taps, reamers, end mills) with an odd number of flutes. With ratchet stop for constant force. Supplied with setting standard. Non slip grip finish (digital models). V anvils with a centerline groove are available. They are useful for measuring pitch diameters of taps which have a small diameter by using single wire