81 Piece Grade A S-0/2 Square Steel Gage Block Set

81 Piece Grade A S-0/2 Square Steel Gage Block Set 81 Piece Grade AS-0/2 Steel Gage Block Set Surface hardness is HRC 64. Each block has a threaded center hole. Made of the highest quality tool steel. 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 Quality and precision is our main focus.  We want to make sure that you are satisfied with your tooling needs in your shop. CNC Tool Solutions offers a wide range of tools that you need to stay productive.  Let us help you find the right products to make you even more productive!