Features Standard: DIN 861 • For the inspection of micrometers according to DIN 863 • Grade 0 accuracy • Nominal sizes (mm): 2.5, 5.1, 7.7, 10.3, 12.9, 15.0, 17.6, 20.2, 22.8, 25.0 • Includes parallel optical flat 30mm dia. x 12mm