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Wheel studs are the threaded fasteners that hold on the wheels of many automobiles. They are semi-permanently mounted directly to the vehicle hub, usually through the brake drum or brake disk. Lug nuts are fastened onto the wheel stud to secure the wheel. When a wheel is removed for tire changes etc., the stud remains in the hub.
Many automobiles instead use bolts to do this, where removable bolts screw into the wheel hub.[1]
Wheel studs can be either factory equipment or aftermarket add-ons.