Oh Scott is right that those are nails. There have been lots of complaints about them. Keep clicking on the picture and you will get a much larger view where you can see there are no threads to keep these puppies in place.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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