Comparison Force 4821R vs Force 4941R-5

The total number of core items included in the set.

In this case, the main items are all devices that are directly used during work: non-separable tools (traditional wrenches, hammers, pliers ...), elements of collapsible tools (for example, a ratchet for removable heads and 5 such heads will be considered 6 units) , as well as accessories (such as extensions or universal joints). Additional accessories — such as lights — may or may not be included in this count, depending on the manufacturer; however, there are usually few such accessories, and they do not fundamentally affect the total number of items.

The most modest modern tool kits include up to 25 units. However, such kits are very popular — they are inexpensive and at the same time can be very versatile. 25 – 50 items is still quite a small number, 50 – 75 pcs can be called an average, 76 – 100 items are more than average, and the most extensive modern sets can include 100 – 150 items or even more.

The general rules for choosing this parameter are obvious: a more extensive set, usually, is more multifunctional, but more expensive, weighs more and takes up more space. It is also worth bearing in mind that with a similar number of items, the specific assortment of these items in differ...ent sets may be different; so when choosing, it is worth specifying not only the number of tools, but also their specific composition.

Number of hex sockets included in the tool kit.

All end heads are accessories for a collapsible tool; during operation, they are mounted on a ratchet, wrench or other similar device. The head itself has the appearance of a characteristic “cap”, which, during operation, is put on a bolt, nut, etc. This design, among other things, allows you to work with parts located in recesses and some other hard-to-reach places that cannot be reached with open-ended, captive or split keys. And compared to a set of classic socket wrenches, the holder plus socket set takes up much less space, providing almost the same functionality.

As for the 6 faces, this type of socket head is the most famous and widespread, because. most modern nuts and bolts have this shape.

Working size range of hex sockets (see above) supplied with the kit. This parameter allows you to evaluate how the heads fit the dimensions of the fasteners with which they are planned to be used.

The number of Surface sockets supplied with the tool kit.

All end heads are accessories for a collapsible tool; during operation, they are mounted on a ratchet, wrench or other similar device. The head itself has the appearance of a characteristic “cap”, which, during operation, is put on a bolt, nut, etc. This design, among other things, allows you to work with parts located in recesses and some other hard-to-reach places that cannot be reached with open-ended, captive or split keys. And compared to a set of classic socket wrenches, the holder plus socket set takes up much less space, providing almost the same functionality.

Specifically, this type of socket is also called SuperLock, or "heads for torn edges." They are intended for hexagonal fasteners and, in accordance with the name, have increased efficiency on heavily worn parts. The working surface of the Surface / SuperLock heads has the form of a circle with six characteristic rounded protrusions, which, when working, are adjacent to the midpoints of the faces of the fastener — due to this, the force is applied not to the corners of the hexagon, but to its sides. This not only allows you to work with stripped edges, but also reduces the risk of failure on intact fasteners; thanks to this, it becomes possible to work with great effort, without fear of damage. On the other hand, this advantage is relevant only if the size of the h...ead strictly corresponds to the size of the part — otherwise, the risk of failure, on the contrary, increases.

The range of working sizes of Surface sockets (see above) supplied with the kit. This parameter allows you to evaluate how the heads fit the dimensions of the fasteners with which they are planned to be used.

The number of bits supplied with the tool kit. A bat in this case is called a working nozzle, which plays the role of a screwdriver tip; in fact, they are most often used with screwdriver handles (see above).

Many types of splines (slots) are used in modern fasteners — starting with the well-known straight, cross-shaped ( Phillips and Pozidriv), Torx sprockets and ending with exotics like Torq-set (a cross with lines shifted from the centre), Pentalobe (with five ledges), etc. .P. In addition, the size of the slots can also vary, and in many cases, tool matching in size is very important. Accordingly, the more bits supplied with the set, the more versatile it is, the higher the probability that it will contain a nozzle of the desired type and size. However, the specific list of bits in the kit also does not hurt to clarify — in order to make sure that it has all the varieties you need. In the characteristics of individual sets, these data are given in the paragraph "Bit sizes" (see below).

The type of extension included with the tool kit.

Extensions refer to "intermediate" devices, if necessary, installed between the main tool (like a screwdriver handle, see above) and the working nozzle. As the name implies, they allow you to increase the length of the working part of the tool — for example, to get to hard-to-reach places. Here are the main options for such devices:


— Hard. Rigid rod extension. It does not give such freedom of action and the ability to get to hard-to-reach places as flexible (see below), but it is considered more reliable, allows you to develop great efforts (often the same as when working without an extension cord) and even allows the use as an improvised lever. Some rigid extensions may also have a crank function (see above).

— Flexible. An extension in the form of a flexible tube, usually made of a metal spiral. Such an extension, like a universal joint (see above), allows you to position the nozzle at an angle to the axis of rotation of the main tool — while the range of such angles is much wider (in some cases they can reach 180 °), and the long length and high mobility of the device are even more expands freedom of action. The disadvantage of flexible extensions is less suitability for work with greater efforts than the rigid ones described above.

— Rigid/flexible. This option is indicated for sets equipped with both types of...extensions described above. This makes it possible to choose an option depending on the specific situation.

If there are several extensions of the same type in the kit, they, usually, differ in the size of the attachment (see "Landing square").

Number of combination wrenches supplied with the kit. Note that some modern kits include only combination wrenches, without any other fixtures or accessories.

Combined are called bilateral keys, on which different types of working profiles are located on different sides. Most often, such keys combine open-end and cap profile, very rarely — open-end and end. The technical features of each of these types are described in the corresponding entries in the glossary. However, anyway, the working dimensions of the profiles in one tool, usually, are the same — this allows, without changing the key, to choose the best option for a specific part, depending on the features of the work. As for the quantity, it is worth considering here: sets with the same number of keys of the same type may differ in the specific sizes of these tools. Such nuances should be clarified before buying separately.

Dimensions of the wrenches supplied in the set. Specified as a range — from the minimum to the maximum size. In this case, the specific distribution of different types of keys over the range may be different. An example is the following set: 17 open-end wrenches, 5 box wrenches, size range 6 – 24 mm. In such a set, box wrenches are almost guaranteed not to cover the entire range of sizes, but for open-end wrenches, this is quite likely. Such details can be specified separately.

Also note that a wrench size of 24mm or more is considered quite large for today's general purpose tools. However, on the market you can find sets that include wrenches for 27 mm, 30 mm and even 32 mm.