Lug nut
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A lug nut or wheel nut is a fastener, specifically a nut, used to secure a wheel on a vehicle. Typically, lug nuts are found on automobiles, trucks, and other large vehicles using rubber tires.
A bolt circle with four lug nuts on an Acura.
Car with wheel studs for use with lug nuts
Five yellow lug nuts for use on a car with wheel studs
Car without wheels studs for use with lug bolts
Wheel sizing
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The wheel size for a motor vehicle or similar wheel has a number of parameters.
Lug nut
…Center cap Wheel sizing Media related to Lug nuts at Wikimedia Commons…
Measuring an outside rim diameter to approximate wheel size
Wheels with Asanti 28 in (710 mm) rims on a police Hummer H2 car
The tire wheel of Subaru BRZ S (DBA-ZC6) with optional parts