To reduce the number of socket wrench by integrating plural socket wrenches.

Eight kinds of socket wrench having the dimension at 8 mm, 9 mm, 10 mm, 12 mm, 14 mm, 17 mm, 19, mm, 21 mm and to be frequently used are integrally assembled with each other freely to be slid. In the case of using this assembly for a bolt and a nut at 8 mm and 9 mm, it can be used without sliding, and in the case of use for a bolt and a nut at 10 mm or more, for example at 14 mm, when a little force is applied while pushing the socket wrench to the bolt and nut, each socket wrench at 8 mm, 9 mm, 10 mm, 12 mm is moved backward by the height of a head of the bolt and the height of a head of the nut. With this movement, a socket wrench at 14 mm covers the bolt and nut, and the whole is rotated for fastening or loosening.