DIN 2245-1
DIN 2245-1 Geometrical product specifications (GPS) - Limit plug gauges - Part 1: For holes from 1 mm up to 40 mm nominal diameter
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2008