During construction and installation works, craftsmen have to use many tools and accordingly carry them to the object with them. To facilitate the work and the tool box, you can make a universal key. The idea of a key is to use the three basic sizes of hex bolts in one fixture.
For crafts, you need a strip of thick metal, not less than five millimeters and wide enough to work with bolts. A sketch of the future key is made on the surface of the workpiece, then with the help of a grinder the metal takes the desired shape. It is better to individually adjust the size for the nuts individually, slowly.
For installation, standard sizes of screw bolts are usually used, so a universal key covers the need for three tools at once. You also do not have to look for a new tool for each size of the hexagon separately.
