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HHIP rectangular gage block set includes 9 blocks: 0.1001" thru 0.1009" step of 0.0001", 49 blocks: 0.101" thru 0.149" step of 0.001", 19 blocks: 0.050" thru 0.950" step of 050" and 4 blocks: 1.000" thru 4.000" step of 1.000". made of the highest quality tool steel. Surface hardness: HRC 64. Complete with Manufacturer's calibration or certificate. With fitted Wooden case with sizes labeled. Offering n.I.S.T. Traceable calibration conforms to mil Std 45662a, ggg G 15C, ISO/IEC 17025 accredited, ISO 9000, 10012 1, ANSI ncsl Z540 1, ISO guide 35 certified. Grade as 0= grade 2(at) : +4/2 millionth.