The range of tools available today for handling fasteners is quite large. However, the most popular are adjustable wrenches. Their unique features and versatile properties make them the most widely used tools. But they also differ in cost.
This tool can replace a whole set of different open-end wrenches. It allows you to adjust the size of the throat, which means the ability to work with nuts of different diameters. The main purpose of the key is to work with clamps, therefore its parts and body must withstand certain loads and not be deformed. For this, the tool is made from durable types of metal, and the surface is covered with special protective compounds.
The standard version consists of the following parts:

Due to their versatility, the adjustable models can work with any nuts and bolts and even with non-standard fasteners of various sizes.
A quality tool should be made of durable metal, which can be an alloy of vanadium and chromium or high-carbon tool steel. And for additional resistance to rust and corrosion, as well as mechanical damage, the following sprays can be used:
In the production of keys, certain standards are used - in Europe it is the ISO 6787: 2001 standard, and in Russia a similar version of the document is adopted - GOST R 54488-2011.
The size of the adjustable toolkit is determined depending on the width of its throat:
The weight of the tool will directly depend on the material from which it is made, its size and the type of protective coating
The main area of application of the key in question is the production of plumbing works. With its help, plumbers can twist the fittings, remove pipe cuttings from rusted or stuck joints, etc. Due to the elongated handle, the operator has a significant physical lever with which the greatest effort is applied to the unscrewed element. This effort is many times greater than when using a conventional open-end wrench. The tightening of nuts on various screwed parts occurs in the same way. Due to the application of uniform forces by means of the lever, the device does not "lick" the edges and does not break the threads.
A LITTLE HISTORY: In Russia, the competition "Professional installer" is held annually. At his last tournament in 2019, the monkey wrench was recognized as an indispensable tool of professional work. Depending on the areas of its application, the places were distributed as follows:
Undoubtedly its advantages include the following properties:
The disadvantages include:
In total, there are three main types:

The latter type of adjustable wrench is worth mentioning separately, since its versatility is a special help for any plumber, gas worker, plumber and even firefighter. It takes up extremely little space in the bag and can replace several work items at once. However, universal devices are also divided into two types: self-locking and end.
The main advantage of this tool is its ratchet-based mechanism of operation and it has quick adjustment. These properties mean that the user can quickly adjust the size of the shed to accommodate the element to be rotated. Self-adjusting the device means that the user does not need to remove it from the part when the throat needs to be adjusted. Among other things, the embossed profile of the lips is made in such a way that sliding of the fasteners or any other damage to the nuts is not allowed during the process. There are quite a few models of self-locking keys on the market, standard adjustment sizes for them are from 17 to 24 millimeters.
The design of this model is provided in such a way that its head forms a universal socket. It easily adjusts to the desired part - bolt head, hook, nut, screw, etc. Accordingly, by fixing the head on the element, it is possible to quickly start the process of unscrewing / twisting. A special difference of this option is a rather large adjustment range - from 7 to 19 millimeters.
The advantages of universal equipment can be safely attributed to:
This shows that the productivity of working with universal tools increases significantly.
Due to the possibility of adjusting the size of the throat (the distance between the "lips"), the use of the device is quite simple - you just need to choose the right size corresponding to the diameter of the workpiece. In the case of a standard tool, you only need to adjust the throat with a worm.
For a gas (universal) key, the order is somewhat different:
At the end of the entire procedure, you can start unscrewing / twisting.
First of all, it should be noted that even for the level of household needs in the household, you need to have two adjustable wrenches at once - a large and a small one. If we rely on the fact that most of the plumbing connections and pipes in Russian houses and apartments are adjacent to the walls, then they are clearly in hard-to-reach places. Thus, using two wrenches at once is much more convenient, for example, when you need to move the sleeve away from a part of the pipe. Accordingly, you need to hold the pipe with one key, and unscrew the sleeve with the second.
The main factors that you need to pay close attention to when purchasing a tool:
IMPORTANT! It is also worth paying attention to the material from which the device is made. If it is covered with a chrome compound, then it will shine. Such a coating means greater resistance to wet environments.If the device is simply painted in different colors (green, blue, black), then this means that it is simply made of steel.
These two main parameters are of the greatest concern to the end consumer of any product. Regarding adjustable wrenches, we can definitely say that if the tool is supposed to be used no more than a couple of times a year, and even then for standard household needs, there is no need to focus on expensive Western brands.
Normal budget options for the above purposes will cost a potential buyer 100 - 300 rubles, but they will not be equipped with additional options, such as, for example, a rubberized handle or a protective cover for the body. The most optimal household option is considered to be models in the range from 500 to 1000 rubles - now they may already have additional modifications, and their quality will be at the level of world brands.
The most expensive models cost from 1,500 rubles and more. They are made of ultra-strong alloys and are supplied with additional components, such as a ruler, oil level, additional mountings, replaceable lips. However, plumbing professionals prefer to have a large and versatile set of all tools at home at once.
A conventional adjustable wrench made of steel. Suitable for infrequent household chores. Due to its small working width, it is preferable to use it with a larger key. There are no additional options in this model. The handle has a hole for attaching to a belt hook.

| Name | Index |
|---|---|
| A type | Adjustable wrench without options |
| Maximum capture, mm | 30 |
| Maximum length, mm | 90 |
| Material | Steel |
| Price, rubles | 500 |
Improved key model. It has an ergonomic grip protected by rubber pads. It can be used both for home needs and for work of a more professional level. It has a telescopic handle, which means it can work in hard to reach places.

| Name | Index |
|---|---|
| A type | Adjustable rubberized |
| Maximum capture, mm | 30 |
| Maximum length, mm | 200 |
| Material | Chrome vanadium steel |
| Price, rubles | 610 |
An excellent sample of German production with a good set of additional options. Has a phosphated coating (anti-slip), which indicates additional comfort when working. The working head is equipped with a measuring ruler. It perfectly tolerates increased loads.

| Name | Index |
|---|---|
| A type | Adjustable phosphated |
| Maximum capture, mm | 50 |
| Maximum length, mm | 250 |
| Material | Chrome vanadium steel |
| Price, rubles | 1500 |
This pipe handling model is not designed for particularly long-term loads. Suitable for infrequent and one-time use. The tool body is painted green and made of regular steel. Nevertheless, during visual inspection "through light", all parts of the device fit tightly to each other.

| Name | Index |
|---|---|
| A type | Gas lever |
| Maximum capture, mm | 28 |
| Lip shape | "G" |
| Lip angle | 45 |
| Material | Tool steel |
| Length, mm | 250 |
| Price, rubles | 400 |
This device has a very narrow specialization and is designed to work with small parts and small diameter pipes. Therefore, it is not worth making special demands on the strength and size of the throat. Perfect for bathroom and toilet piping operations.

| Name | Index |
|---|---|
| A type | Gas lever |
| Maximum capture, mm | 25 |
| Lip shape | "G" |
| Lip angle | 45 |
| Material | Tool steel |
| Length, mm | 300 |
| Price, rubles | 600 |
An expensive and versatile tool suitable for all kinds of work. It copes equally well with small fasteners and large diameter pipes. The extra-strong material of manufacture (carbon steel) allows you not to take special care when applying pressure to the lever.

| Name | Index |
|---|---|
| A type | Gas lever |
| Maximum capture, mm | 90 |
| Lip shape | "G" |
| Lip angle | 90 |
| Material | Carbon steel |
| Length, mm | 630 |
| Price, rubles | 1500 |
This key pliers is designed to grip objects of various shapes and sizes for loosening / tightening. Can also be used as a pipe / pipe device. They have poured handles and are made of the strongest carbon steel. With their help, a reliable and powerful fixation is provided.

| Name | Index |
|---|---|
| A type | Plumbing pliers |
| Maximum solution, mm | 50 |
| Material | Carbon steel |
| Additional options | Rubberized handle |
| Weight, gr | 370 |
| Length, mm | 320 |
| Price, rubles | 500 |
These adjustable pliers can replace a complete set of any keys. They are used for gripping parts up to 50 mm and their long-term fixation. The adjustment is carried out using a spring-loaded button. The lips are crafted from durable chrome vanadium steel, making it possible to work with high quality finishes without fear of risk of damage.

| Name | Index |
|---|---|
| A type | Plumbing pliers |
| Maximum solution, mm | 50 |
| Material | Chrome vanadium steel |
| Additional options | The handle of their plastisol |
| Weight, gr | 560 |
| Length, mm | 260 |
| Price, rubles | 3300 |
This adjustable key has as many as 14 positions for fixing parts of various sizes. It can be used for any type of installation work - from the most rude to the most delicate. The jaws have a smooth polished surface, so there is practically no risk of damage to the fixed part. The lower jaw is repositioned by pressing one button.

| Name | Index |
|---|---|
| A type | Plumbing pliers |
| Maximum solution, mm | 27 |
| Material | Chrome vanadium steel |
| Additional options | The handle of their plastisol |
| Weight, gr | 200 |
| Length, mm | 150 |
| Price, rubles | 5100 |
The analysis of the market showed that the considered instruments are present on it in sufficient quantity. They can be purchased both via the Internet and at retail sites, and the price will not vary greatly. At the same time, the mass Russian buyer prefers Asian or domestic models due to their adequate cost and more or less normal quality. Expensive models from Western brands are more often purchased by professional specialists and for work in the private sector (design services).