To know the exact diameter of the wire will fail, and no micrometer or Vernier caliper, if you use … normal range.
This is quite tightly wound on the rod a small number of turns of wire, then measure the width of the winding divided by the number of turns: the number obtained will be the required diameter.
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OF BROKEN PLIERS
Of broken pliers get turns out to be excellent cutters. It is only necessary to sharpen the tool a sanding disc, giving it the shape as shown in the figure.