[Size]: 9 blocks: 0.1001-0.1009" in 0.0001" steps; 

         49 blocks: 0.101-0.149" in 0.001" steps;

         19 blocks: 0.050-0.950" in 0.050 steps;

           4 blocks: 1-4" in 1" steps.

[Material]: Alloy tool steel with hardened to 65 RC.

[Instructions]: Blocks manufactured under carefully controlled conditions, allowing for the highest degree of accuracy when used at room temperatures of 68 ℉ (20 ℃). Accuracy unit: uinch.

[Grade]: All gage block sets are certified by an accredited ISO-17025 Gage lab with long form certification. Individual serial numbers on each block, regardless of grade.

[Application]: Gage blocks are commonly used to calibrate fixtures and precision instruments in workshop, inspection, and dimensional metrology applications, to inspect tools such as mounting tools, cutters, fixtures, and mechanical parts, and in the gage manufacturing process itself. Grade B gage blocks are commonly used in workshops for calibrating and inspecting mounting tools and cutters.