81PC SQUARE STEEL GAGE BLOCK SET (GRADE B)

• Each block with center hole threaded.


• Meet or exceeds U.S. Federal specification GGG - G - 15C.


• Complete with manufacturer's calibration.


• Made of the highest quality tool steel.


• Surface Hardness: HRC 64


• With sturdy fitted wooden case.
• With center hole.


• Offering N.I.S.T. Traceable Calibration


• All calibration conforms to:


• MIL-STD 45662A


• GGG-G-15C


• ISO/IEC 17025


• ISO 9000, 10012-1


• ANSI-NCSL Z540-1


• ISO GUIDE 25 Certified