Total number of items
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.Socket heads sizes (6 points)
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.
Bits
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).
Bit sizes
Varieties of bits (see above) included in the set.
Note that this paragraph specifies not just the size, but also the type of slot for which this or that bit is designed. This type is indicated by a letter index followed by a number describing the size — for example, SL5. Here are the most popular designations found in modern bits:
— SL. Flat bits for straight slot. The size is indicated in millimetres.
— Ph. Classic cross bits. The size is indicated by a conditional number.
— P.Z. Bits for a modified cross slot with improved engagement, have additional edges. The size is indicated by a conditional number.
— TX, T. Torx bits, with six-pointed sprocket tips. The size is indicated by a conditional number.
— H. Hex bits, with hex tips. The size is indicated in millimetres.
If there is more than one bit of a certain type in the set, the number is specified after the designation, for example, PH2x2.
Open end wrenches
The number of open-
end wrenches supplied in the kit. Note that some modern kits
only include open-end wrenches, without any other fixtures or accessories.
Open-end wrenches are called classic wrenches with a U-shaped working profile. When working, they cover the part from three sides (on two — if the key clings to the very tips of the "horns"). Because of this, such wrenches lose to ring wrenches in terms of uniformity of impact and are less suitable for work in which significant efforts are required (horn tools are more likely to break off the part). However, in most cases this shortcoming is not critical. In addition, the U-shape of the profile allows you to work with pipelines, hoses, etc., on which it is impossible to put a spanner wrench, and also makes it possible to hold an open-end tool during operation similar to a screwdriver — not perpendicular to the axis of rotation of the fastener, but parallel. Due to this, in some cases, this type of key may well replace the end keys (see below).
Note that most often modern open-end wrenches are made double-sided, with working profiles of different sizes at different ends. 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.
Combination wrenches
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.
Wrench sizes
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.
Hex wrenches size
Working size range of hex wrench sizes (see above) supplied with the kit. This parameter allows you to evaluate how the keys fit the dimensions of the fasteners with which they are planned to be used.
Pliers
Number of
pliers supplied in the kit.
Initially, pliers are a device for holding, manipulating and squeezing various parts, having two handles and two characteristic flat jaws (hence the name). However, in the case of tool sets, this term often means a more functional device — pliers. Modern pliers, in addition to the flat part, have the following equipment:
— one or two recesses on the jaws, allowing you to capture pipes and other round / polyhedral parts;
— a pair of blades that allows you to use the tool as wire cutters;
— devices for cutting wire from the outside of the jaws (usually on both sides).
In most modern tool kits, only one pliers are provided, and, usually, these are pliers — thanks to the extensive capabilities of such products, such equipment is most often quite sufficient. However, there are also exceptions to this rule. In such cases, additional pliers can be both smaller pliers and other types of tools; this point should be clarified separately, and the options may be as follows:
— actually pliers of a traditional design, without additional equipment;
— thin-nosed pliers with long, elongated jaws, well suited for delicate work;
— round-nose pliers — with round-shaped jaws, used, in particular, for bending wire and other parts.
