The security hardware from Vision X comes in several standard metric sizes to fit most lights, but is also a suitable upgrade for any matching size metric hardware. Security nuts secure the mount of your light to the vehicle, by adding security nuts to the base bolt and any base assembly bolts lights cannot be removed without the specially designed key. All security nut items include (2) security nuts and (1) keyed socket tool. All security bolt items include (2) security bolts and (1) keyed allen wrench tool. See table below for security hardware applications.