This part of ISO 2725 specifies dimensions, designation and marking of machine operated "non-impact" square drive sockets.
NOTE 1 Machine operated "non-impact" square drive sockets are listed under number 301 in ISO 1703:1983.
NOTE 2 Hand-operated sockets are dealt with in ISO 2725-1. Machine-operated "impact" sockets are dealt with in ISO 2725-2.