Small metal 'spanner' issued with the Mk.IV series goggles. Used to fasten/unfasten the nut of the adjustable goggle frame bridge. Note that one of the 'pins' has partially sheared off but the spanner does still work (just) with care. Note that there are variations in size/pattern of these spanners and the gap between the pins varies. Fills a gap in the spares box if yours is missing. Stock code G23463B.