Mechanical Micrometer Head, Range 0 in to 1/2 in, Resolution 0.001 in, Accuracy 0.0001 in, Dimension Type Inch, Mouting Hub Diameter 3/8 in, Operation Type Mechanical, Rotating Spindle (Yes/No) Yes, Spindle Shape Spherical, Thimble Type Plain, Includes Spanner, Lock Nut Type Spindle Lock, Long Form Calibration Certificate No, Maximum Measurement - Inch 1/2 in, Minimum Measurement - Inch 0 in, Scale Finish Chrome, Spindle Diameter 5 in, Spindle Material Steel, Standards JIS B 7502