Safety wheel nut

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The Disc-Lock safety wheel nut is a vibration- and shock-proof lug nut that is designed to eliminate wheel loss from trucks, trailers and buses. It is as easy to install and remove as a conventional lug nut, but has a positive locking system in the form of rising cams which are joined together to form one assembly. The angle of the cams is greater than the pitch angle of the thread on the stud, causing a wedging action to take place, thus the nut locks and will not come loose, the company says.

Disc-Lock International (www.disc-lock.com)