SPI Standard Outside Mechanical Set Set includes... 0-150mm Measuring Range 0.01mm Graduations Accuracy... 0-25mm model: + 0.004mm 25-50 Model: + 0.004mm 50-75 Model: + 0.005mm 75-100 Model: + 0.005mm 100-125 Model: + 0.005mm 125-150 Model: + 0.005mm Ratchet Stop Carbide Spindle Faces 0.25" Spindle Diameter NIST Traceable Calibration Certificate Furnished in fitted case Micrometers included in set... 0-25mm Outside Micrometer 25-50mm Outside Micrometer with standard 50-75mm Outside Micrometer with standard 75-100mm Outside Micrometer with standard 100-125mm Outside Micrometer with standard 125-150mm Outside Micrometer with standard