This International Standard specifies the technical, dimensional and test requirements for hand-operated sockets and box wrenches used for the attachment and detachment of metric spline drive fasteners according to IS0 7403. It applies to tools listed in the classification of clause 3. This type of tool is mainly used in the aeronautic industry. The overall dimensions are not in accordance with other International Standards relating to dimensions. NOTE - The figures in this International Standard are descriptive, not restrictive, and are not intended to exclude any sockets and box wrenches provided they be in accordance with this International Standard.