What are these pictured fasteners that keep your wheel secure while you drive?

Since lug nuts keep your wheels securely attached to the vehicle, a loose one could pose a significant hazard. While you can check each nut on a standard passenger car, larger vehicles, such as tractor-trailers, come with a detection system that alerts the driver if there's an issue.

Asked by Don Ayres · Last updated 5 years ago · 5.5M views · SOURCE