This 81 Piece SAE Gauge Block Set Is Made Of The Finest Quality Tool Steel. It Has A Series Of Nominal Size: 0.05, 0.10, 0.1001-0.1009 (9 Blocks) , 0.101-0.109 (9 Blocks), 0.110-0.149 (40 Blocks), 0.15 0.20, 0.35…. 0.95 (17 blocks) 1.000, 2.000, 3.000, 4.000. Comes In A Custom Fitted Wooden Case. Standard Reference Temperature : 20 degree Celcius (68 Degree F) Coefficient of Thermal Expansion : (11.5 +- 1.0) X 10 to the power of -6 / Dgree Celcius

* Highest Quality Steel

* Surface Hardness: HRC 64; Grade B

* Comes with a Cerificate of inspection

* Meets or exceeds Federal GGG-G-15C

* Fitted Wooden Case ; Sizes Clearly Marked