81 PIECE GRADE AS-0/2 SQUARE STEEL GAGE BLOCK SET (4101-0051)

81 Piece Grade AS-0/2 Steel Gage Block Set Each block has a threaded center hole. Made of the highest quality tool steel. Surface hardness is HRC 64. Accurate to +4/-2 millionth. Meets or exceeds U.S. Federal specification GGG - G - 15C. Complete with manufacturer's calibration or certification that is not NIST traceable. Supplied in a sturdy fitted wooden case. ~ Shipping Weight: 10.8 lbs