ISO 10102:2018 Assembly tools for screws and nuts - Double-headed open-ended engineers' wrenches.
ISO 1085:2016 Assembly tools for screws and nuts - Double-ended wrenches - Size pairing.
ISO 691:2005 Assembly Tools for Screws and Nuts - Wrench and Socket Openings - Tolerances for General Use
DIN 3110:1987 Engineers wrenches, double head, open end, with unequal jaw widths; test torques series c.
DIN 475-2:1982 Wrench and socket openings.
