Landing square
The size of the square of the bits / sockets supplied in the kit.
The seat square is a standard fixture used in bits and sockets. For installation on a bit holder, ratchet, etc., the size of the square must correspond to the size of the seat. However, complete fixtures (like the same bit holder) by definition have fasteners of the right size, so you have to pay attention to the size of the square mainly if you plan to use nozzles with third-party tools.
Also note that the overall dimensions of the complete bits / heads can be estimated from the landing square: the larger the square, the larger the nozzles. For example, in 1/2" sockets, the size starts from 8 – 10 mm, and in 1" sockets — from 24 mm.
SL bits (Slot)
The total number of
bits of type SL supplied in the set.
Marking SL means bits with the simplest flat tip. For such a tip, in principle, strict compliance with the size of the slot in the fastener is not necessary — it can be a little narrower or a little wider. In addition, flat-slot fasteners are used relatively rarely today, more advanced varieties have become more common. Therefore, the SL-type bit in the kit, usually, is not much.
SL bits sizes
The sizes of the SL type bits included in the set and the number of bits of each size.
For the bits themselves, see above. The size is indicated by a number indicating the width in millimetres; if the bit is more than one, after the size their number is specified. For example, the marking "SL4, SL6x2" means one bit for 4 mm and two for 6 mm.
PH cross bits (Phillips)
The total number of
bits of type PH supplied in the set.
The PH marking stands for a classic cross-shaped tip without additional tricks. These bits have a larger area of contact with fasteners than flat SL bits and allow you to work at higher torques. At the same time, when the load increases to a certain level, such a tip pops out of the slot. In some situations, this is an advantage, because avoids damage to the tip and fasteners due to too much force; however, other types of tips, such as PZ, are better for working at maximum forces (see the relevant paragraph).
PH bits sizes
The sizes of the PH type bits included in the set and the number of bits of each size.
For the bits themselves, see above. The size in this case is indicated by a conditional number; the larger the number, the larger the slot for which the nozzle is designed. If there is more than one bit, the number of bits is specified after the size. For example, the entry "PH1, PH2x2" means one relatively small bit and two larger ones. And there are also very small sizes PH0, PH00 and even PH000. Such bits, due to their tiny size, are appropriate
for repairing phones, watches, cameras and other small electronics.
PZ cross bits (Pozidriv)
The total number
of PZ type bits supplied in the set.
The PZ is a modified version of the PH cross tip (see the relevant paragraph). In PZ tips, the angles are more pronounced, there are additional edges to increase the contact area with the slot — thanks to this, unlike PH, these tips do not push out of the slot even with a very large effort. All this makes the PZ a fairly convenient option for working at high loads, including uneven — in particular, for tightening self-tapping screws.
PZ bits sizes
The sizes of the PZ type bits included in the set and the number of bits of each size.
For the bits themselves, see above. The size in this case is indicated by a conditional number; the larger the number, the larger the slot for which the nozzle is designed. If there is more than one bit, the number of bits is specified after the size. For example, the entry "PZ1, PZ2x2" means one relatively small bit and two larger ones.
Bit length
The size of the bits in length characterizes the range of work. The standard value for most bits is a length of 25 mm - these are
small bits. There are, of course, other approximate values, for example 30 mm. However, the part is not always easily accessible, so the bits can be
medium in length (about 50 mm) and even
long(70 mm or more). Such a variety of sizes allows you to choose a set for the specific needs of the master.
Socket heads (E-profile)
The total number of E-profile sockets supplied in the set.
E-profile, also called
"external Torx" (E — "external"), has the shape of a characteristic six-beam asterisk. These sockets are used only with fasteners that also have an E-profile, they are not suitable for ordinary hexagons. Fasteners of this form are found mainly in cars.
