... Rectangular Gage Block Sets 1) Material: steel, carbide steel. 2) Inch sets: 81pcs, 36pcs (with grades of 2, 3 and B) * Steel ... provides exceptional wringing characteristics* Individual serial numbers on each block, regardless of grade* Manufactured a temperature-controlled environment to ... exceed standard of the GGG-G-15C (inck block) and ISO (metric block), Also made in accordance with DIN861.* With ...