Installs quickly using simple hand tools. Mounts standard Givi Monokey topcases (ie E45 Elegant E460 Delux E52 Maxia) or the flat stable surface can be used as a solid toprack when the topcase is not needed. Givi E-series topcase racks are for use with Givi Monokey topcases ONLY and are NOT compatible with Givi Monolock topcases.