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In our daily life there will be a lot of different types, the common peace head bolt, we need to prepare more than one wrench is not very convenient, and often in the process of using in model of this phenomenon, this design combines the above problems and design have 4 mm, 6 mm, 8 mm and 10 mm model size combination in a wrench. The user can according to their own needs to use different types of wrench, do not need to change connection, which saves material, also convenient for the user.