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See more product details HHIP square steel gage block with center hole threaded. Meet or exceeds U.S. Federal specification ggg - G - 15C. Complete with Manufacturer's calibration or Certification. Made of the highest quality tool steel. Surface hardness: HRC 64. With sturdy fitted Wooden case. All calibration conforms to: Mil-Std 45662a, ggg-g-15c, ISO/IEC 17025 accredited, ISO 9000, 10012-1, ansi-ncsl z540-1, ISO guide 25 certified. Grade as-1= grade 3( BT): +8/-4 millionth accuracy. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.

