Rhino-Rack Backbone 3 Bar System for Jeep JK 2007-2014 Only Backbone system strengthens the roof structure of your Jeep, allowing you to add a roof rack system (sold separately) on your factory hardtop Frame brackets install around inside window frame and along outside window jamb - some drilling is required Platforms attach to outer brackets along roofline to provide a flat, stable mounting surface for crossbar legs Mounting hardware included