ISO 2725-1:2015 specifies dimensions, the designation, and the marking of hand-operated square drive sockets with operating end and having a hexagonal or double hexagonal form in accordance with ISO 1174-1.
NOTE 1 Hand-operated square drive sockets are listed under number 2 1 02 01 0 in ISO 1703.
NOTE 2 The figures in this part of ISO 2725 are given only as examples. They are not intended to influence the manufacturer's design.