To fasten/loosen a hexagon head bolt or nut by utilizing an L-shaped wrench.

This L-shaped wrench is fitted to a socket wrench fastening/loosening the hexagon head bolt or nut to fasten/loosen a screw. In this state, the socket wrench is prevented from being separated/falling from the L-shaped wrench in use. The socket wrench and the L-shaped wrench, therefore, are made into a combined state since the socket wrench is fitted into a groove provided in the L-shaped wrench in an inner diameter of a snap ring provided in the socket wrench. When the socket wrench is replaced with the socket wrench of another size, the socket wrench is separated from the L-shaped wrench when performing an operation for separating the socket wrench from the L-shaped wrench, the next socket wrench is inserted to be usable in the previous state.

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