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Wrenches are used for tightening or loosening screws and bolts (square or hexagonal shape) by hand. These wrenches are available as ring wrenches and open-end wrenches. Ring wrenches have the advantage that screw heads or nuts are completely enclosed and therefore a full, smooth force transfer occurs. Adjustable wrenches are special versions of wrenches, which have a knurled screw for adjusting the mouth width. Wrenches are used in the assembly of electrical connections, for example.