The Gauge Blocks are length measuring standards. The accuracies conform to GB, ISO, DIN861, GGG-G-15C standards. They are used for length measurement. Gauge Block Set Table - ISO 3650Item No.   Pcs.per set    Class    Series of nominal size (mm)      Blocks in set    Weight (kg)901-11         103*           0,1,2             1.000.5~100                          1-49          2.165 (1.683)     -12           87*           0,1,2             1.001~100                             9-49          1.78 (1.385)     -13           76*           0,1,2             1.005~100                             1-49          1.02 (0.793)     -14           47*           0,1,2             1.005~100                             1-19          1.515 (1.178)     -15           32*           0,1                1.005~50                               1-9            0.412 (0.320)Note: in the parenthesis is the weight of ceramic gauge blocks.