DIN Standards Committee Tools and Clamping Devices
ISO 3318
Assembly tools for screws and nuts - Double-headed open-ended wrenches, double-headed box wrenches and combination wrenches - Maximum widths of heads
Schraubwerkzeuge - Doppelmaulschlüssel, Doppelringschlüssel und Ringmaulschlüssel - Größte Außendurchmesser am Kopf
Responsible national committee
NA 121-05-01 AA - Assembly tools for screws and nuts, Fastening tools
Responsible international committee
ISO/TC 29/SC 10 - Assembly tools for screws and nuts, pliers and nippers