There are many nuts - but only one wrench. With the universal head it is really possible to unscrew any nut, as long as its dimensions are between 7 and 19 mm. The head is made of chrome vanadium steel and has a large safety margin. The peculiarity of this head is not only in its ability to change size, adjusting to each nut, but in the ability to work with it with a drill or screwdriver. Especially for this purpose in the delivery set the seller encloses an adapter, which is clamped in the chuck of the power tool, and the head itself is put on it. But if desired, you can also work with an ordinary ratchet wrench.