How do I know if my lug nuts / bolts need a special tool for installation and removal?

Conventional lug nuts / bolts will have six flat sides designed to interface with a traditional socket.

Splined lug nuts / bolts are able to be identified by grooves running down the outer length of the lug nuts / bolts that are removed with the installation and removal tool, or 'lug key'. 

In some instances, your vehicle may have a wheel lock which will also have it's own separate lug key. This is usually easily identifiable if one lug nut / bolt on each wheel is substantially different from the others. 

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