Starrett 701B Groove Micrometer; 1.500-2.500" Range-Friction Thimble

The Starrett 701B Internal Groove Micrometer has a measuring Range of 1.500-2.500" with depth of grooves of up to 5/64", a Friction Thimble and Lock Nut. These micrometers measure grooves for retaining rings and "O" rings, oil grooves and washer grooves as well as bores and recesses.