If you decide to buy a set of four bolts ("secrets") and an adapter key, we advise you not to rush. Having gone through only one car market, we counted 12 varieties of such sets. Their prices fluctuate depending on the material from which they are made and the originality of the design.
There is an obvious consumer goods, which is an eccentric bolt with the same key. A bolt with a large eccentric head height is not secured against twisting with a spanner. This option may be of interest to owners of those cars that have alloy wheels with a deep seat under "secret". The price of such protection is from 3 to 5 USD.
Bolts with a rotating protective ring and all with the same eccentric cost up to $10. But the ring makes unpleasant sounds when driving, giving the impression that a rope with tin cans was tied to the car. Many get rid of this noise by twisting a simple rubber band from curlers under the base of the bolt.
Having reached the price of 15 USD, the secret bolts begin to resemble no longer "ugly ducklings", which starved to rust on the counter in the open air, and white swans proudly raising their steel head over a bunch of all sorts of washers, nuts, screws, gaskets lying right there. As a rule, these "secrets" are distinguished by high quality workmanship, appropriate heat treatment and the presence of a protective coating.
There are also many design options. All of them, as a rule, with a protective ring attached to the bolt through a rubber seal that eliminates extraneous noise. They no longer have one, but two keys (one spare). The forms themselves "secrets" quite varied. Starting from the simplest, but already improved eccentrics, to intricate spline connections: these, in our opinion, are the most reliable and easy to install.
The last class includes those whose cost is from 15 to 25 USD. These specimens seem to have descended from the canvases of avant-garde artists. Here you and "shamrocks", and irregularly shaped nuts, and a truncated cone, and bolts with wrench holes resembling a sign "Behind the wheel - deaf". All of them are made with a protective ring. There are very convenient and practical ones, but there are also those that raise doubts about their suitability for work.
Buying "secrets" in our city, you, as a rule, are not immune from the fact that an attacker does not have the same key. The fact is that manufacturers are unlikely to change the size of the bolts and keys to them, ensuring the individuality of each set. Therefore, if we put "secrets", then purchased in another city. Or order specially from a familiar turner. In this case, the probability that your wheel will get to a neighbor in the parking lot is already less, but...
And yet it makes sense to install secrets - technically inexperienced guys are excluded from the number of potential applicants for your wheels, for "unauthorized" Removing the wheels requires additional time, and as a result of careless manipulations by competent intruders, the alarm installed on the machine may have time to work. Unless, of course, the attackers are literate enough to "neutralize".
We will not go into technical details, thus tempting "irresponsible". Let's just say that if the owners of alloy wheels with recesses hiding bolt heads can "to sleep calmly" with one "secrets" on the wheel, then it makes sense to mount steel wheels with three or four "cunning" bolts (or nuts), preferably different, which is quite expensive and troublesome. However, healthy sleep is more expensive.