(click to enlarge) This lightweight, compact duraluminum tool is a very versatile and unique tool, and is bound to be a one of the most valuable tools in your toolbox. The 5.0mm socket fits M2.5 nuts and the 5.5mm socket fits M3 nuts. (click to enlarge) The 5.0mm socket is the best tool for tightening/loosening M2.5 nuts from off-road shock pistons. The 5.5mm socket is the best tool for tightening/loosening M3 nuts, such as those on the following: M3 nuts that secure off-road shocks to shock towers, M3 nuts that connect camber linkages with C-hubs and uprights, rear arm with upright, and steering linkages with Ackermann plate. Also used for mounting a touring car bodyshell rear wing. (click to enlarge) (click to enlarge)