Easy to install, easy to use motorcycle helmet lock that looks good on your bike. Pair is keyed alike and comes with 4 matching keys and 2 helmet extenders. See Lidlox website for installation video. Fits all Harley Davidsons EXCEPT 2004 and later Sportsters. The newer Sportsters take the Item 2004 kit with the 6mm metric bolt. The Harley Street 500 and Pan America take the 2004 Metric kit. Lidlox work with ALL helmets using the included helmet extender.