The lock just hides the tool used to tighten down the bars to the roof rack. If you were to unlock it.. you would twist the lock while the grips tighten around the bars. I've never looked at a Compass's roof rack, but if it is similar to the Patriot's it'll work. I believe my bars are 59'' long so they do stick out over the side of my Jeep. So if your getting in and out of your Jeep watch your head. It sticks out a couple inches. I'm a member on another forum and some of the guys there have actually cut these bars down a few inches so they don't over hang. Not a bad investment for 55 bucks.
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