Nengun in Japan and received them in 2 weeks. This design strikes me as being a
potent one but their website
[ http://www.nengun.com/kyo-ei/dency-2000-lock-nuts ]
lacks detail about how it works. I thought I'd add a few more specifics to their
description.
L to r: socket w/ lug nut key pattern, lug nut, lug nut cap, lug nut and cap w/o
prongs released, nut and cap w/ prongs released, cap with magnetic key The lock has two security features: a lug nut with a forged key pattern and a
locking cap which covers the lug nut. What sets the Dency lug nut apart from many other lock nuts is that it definitely
doesn't have a cylindrical shape. This helps thwart the strategy of pounding a
socket onto the lock nut, thereby joining the two with friction, and turning the nut
with a breaker bar inserted into the socket. Not being able to turn the lug nut, or having access to it at all, is the second level
of Dency lock security. The cap contains a spring loaded mechanism that, when the
cap is placed over the nut and pressed on to it, releases two prongs. These
released prongs extend into a groove in the lug nut. The prongs resist cap
removal and cause the cap to spin independently of the lug nut when the cap is
turned. Cap removal is accomplished by placing a key containing a magnet pattern
on the cap and pressing. This causes the prongs to retract. I tried to defeat the cap locking mechanism with a couple of magnets of various
size, one quite powerful, without success. At 110 to $120 (depending on finish) delivered these locks don't come cheap.
Perhaps for most people they are overkill but, if nothing else, at least they're
interesting IMHO.
 Chance favors the informed
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Dency 2000 wheel locks. I ordered a set of these from - 
