Mitutoyo 516-931-26CAL Steel Rectangular Micrometer Inspection Gage Block Set with Calibration, Inch, Optical Parallel, 0.0625"-2.0" Range (9 Blocks), Meets ASME Grade AS-1 Specifications

I’m a cnc machinist and this is a must who works under tight tolerances. I use it on a weekly basis to check my mics. I don’t know how, but it was calibrated by mitutoyo. I’m very very pleased with this purchase.

good..