The Gauge Blocks are length measuring standards. The accuracies conform to GB, ISO, ... , 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 ... .320)Note: in the parenthesis is the weight of ceramic gauge blocks. Gauge Blocks - DIN 861