Every road-legal motorcycle has a mounted license plate. Not in the least because it is mandatory.
However, license plate sizes tend to differ between countries, which often means that you have to get a drill out first. These licence plate holders act as an adapter, and allow you to attach every type of licence plate without a problem.
They fit on any motorcycle and license plates can be attached without drilling new holes. Moreover, the license plate holder gives your license plate some extra strength.