Comparison Yato YT-38891 vs Yato YT-38901

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 the...se items in different sets may be different; so when choosing, it is worth specifying not only the number of tools, but also their specific composition.

The size of the "seat" for which the socket heads included in the package are designed (see below), in other words, the size of the square hole on the back of the head used for installation on a ratchet, wrench or other similar tool. Accordingly, the tool for working with heads supplied in the kit has the same dimensions of the landing square; and in the absence of such tools in the kit, data on the size of the heads will be useful for its selection.

There is a generally accepted standard for these sizes, providing for the designation in fractions of an inch — from 1/4 "to 1". Thanks to this, heads and tools from different sets can be quite compatible — just matching in size is enough. Most often in modern hand sets there are options in 1/4 "and 1/2", a little less often — 3/4" and 3/8". Some sets include several variants of the landing square at once.

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).

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.

The number of ring wrenches supplied in the kit. Note that some modern kits include only ring spanners, without any other fixtures or accessories.

The working profile of the ring wrench has the shape of a ring; the inner surface of this ring, in direct contact with the fastener, has the shape of a polyhedron or "asterisk"; Such a wrench covers the fastener from all sides, which provides an even distribution of the load and better suitability for working with high forces than open-end wrenches (see above). At the same time, cap tools are less versatile: if the shape of the part does not match the working profile or if this part is located in a hard-to-reach place, serious problems can arise during work. In addition, they are not applicable to work with fastening hoses, pipes and other similar items — unless such an item is fixed only on one side, and on the other, a key can be put on it.

Note that most often modern box 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.

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

The working part of such a tool looks like a characteristic “cap” at the end of the handle (hence the name). This shape allows you to easily work in some hard-to-reach places where it is impossible to reach other types of wrenches — for example, recesses. But the general design of modern socket wrenches can be different. One of the most common options is an L-shaped handle with two "caps" of the same size, at both ends. When using a working profile on the short side of such a tool, the rest of the structure forms a long lever, allowing you to develop a fairly significant force; and the presence of a “cap” on the long side makes it possible to reach parts located in recesses of great depth and other similar places. Another design option is a wrench with a universal joint (see below); in such models, on different sides of the handle there are working profiles of different sizes. There is also a more specific version — a hollow tube with "caps" on both ends (also having different sizes) and a through transverse hole for a rod that plays the role of a rotary knob.

Separately, we note that socket wrenches are especially popular in car maintenance, although their use is not limited to this.

Presence in a set of wrenches with a universal joint

This function is found mainly in box and socket wrenches (as well as on the corresponding sides of combination wrenches). The specific number and type of such keys may be different, these details should be specified separately. Anyway, the hinge is a device that allows you to rotate the working part of the key relative to the rest of the tool. This, in particular, makes it possible to work in some hard-to-reach places where it is difficult to reach with a traditional key.

We emphasize that this feature should not be confused with a universal joint, made as a separate accessory; for more details on it, see the paragraph of the same name below, but here we note that a separate hinge is used with collapsible tools — such as ratchet wrenches, knobs, etc.

The number of imbus keys included in the tool kit.

Such keys are a type of hex key (see above). In fact, even ordinary hex keys are often called “imbus” (from INBUS, the trademark under which they were once patented). However, in our catalog, only those hex keys are classified as imbus keys, the design of which includes a characteristic rounded tip, similar to a ball soldered to the end of the key. Such a tip allows you to tilt the wrench at a certain angle relative to the axis of rotation of the fastener when working, which can be very convenient when working in hard-to-reach places.

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