This International Standard prescribes the technical specifications for square drive adaptor hexagon or cylindrical flat inserts for power socket wrenches. It applies to square drive adaptors with hexagon drive or with cylindrical flat end drive as defined in ISO 1173, and to driving squares for power socket wrenches as defined in ISO 1174-2. Square drive adaptors with hexagon drive, for power socket wrenches, are listed under number 5 2 00 02 0 in ISO 1703.