This standard specifies the properties of the following types of double end box wrenches: double head flat,
double head offset and double end modified offset.
BS EN 3711:2008 Referenced Document
EN 2424 Aerospace series - Marking of aerospace products
EN 3709 Aerospace series - Wrenches and sockets, bi-hexagonal - Technical specification
ISO 691 Assembly tools for screws and nuts - Wrench and socket openings - Tolerances for general use
BS EN 3711:2008 history
2008BS EN 3711:2008 Aerospace series - Wrench-double ended, bi-hexagonal - Straight, cranked, offset