Fit For: For 2010-2017 Chevrolet Equinox/ GMC Terrain Roof Rack Crossbar A roof rack is a set of bars secured to the roof of a motor car. It is used to carry bulky items such as luggage,bicycles,canoes,kayaks,skis,or various carriers and containers. They allow users of a vehicle to transport objects on the roof of the vehicle without reducing interior space for occupants or the cargo area volume limits such as in the typical cars trunk design. Please see the photo for the dimensions .