Insize 3290-347, V-ANVIL MICROMETER_7 flutes_2.6-3.4″, 6928640377990

Graduation .0001″.
Measure the outside diameter of cutting tools (such as taps, reamers, end mills) with 3 or 5 flutes.
Ratchet stop.
Carbide measuring faces.
Supplied with setting standards