lug wrench, also known (in the UK) as a wheel brace or wheel wrench,
a type of socket wrench used to tighten or loosen lug nuts on wheels.
One type of lug wrench takes the form of an L-shaped metal rod with
a socket wrench at the end of the short arm and a prying tip at
the end of the long arm. The prying tip is used to remove hub caps
that may be covering the lug nuts. Another type of lug wrench, sometimes
called a spider, is in the shape of a cross, with different sized
sockets on each of the four ends.
Ideally, lug nuts should be tightened with a torque wrench. Lug
wrenches are less expensive tools because they are not equipped
to measure or limit the force used. Installing a wheel with a lug
wrench involves guesswork about the proper tightness. Too much force
can strip threads or make the nuts difficult to remove. Also, uneven
torque between the various lug nuts, or excessive torque, can lead
to warping of the brake rotor if the vehicle has disk brakes.