Starrett, 67130, 1 Inch, 4-1/16" Plain Thimble, 5/16" Dia x 1-7/16" Long Spindle, Mechanical Micrometer Head 5-1/2" Long, Accurate Up to 0.0001", Rotating Flat Spindle, 1" Dia x 7/8" Long Stem, Carbide Measuring Face