Micrometer Checking Set Included in the set... Meets Federal Spec GGG-G-15c and ISO 9000 requirements. Grade 0 Gage Block sizes included are as follows... 0.105", 0.210", 0.315", 0.420", 0.500" 0.605", 0.710", 0.815", .920" and 1.000" For checking various spindle positions of entire micrometer range. Optical flats for checking micrometer flatness are 0.500" and 0.5125". Furnished in fitted case
