Just curious if you just tighten them snug or if there is a rated spec for these? I've searched. There's no information.

 

If you have talking about the three bolts that hold them to the door, well I just snugged mine up tight...been about 2 years and they have not fallen off yet

 

I just snugged mine up also, installed this last summer and have put a number of miles, smacked the right side on the ferry at Whidby Island Washington, have run through sagebrush in Northern Nevada and a few Willow trees at water crossings, no problems at all. But did manage to put some Nevada pinstripes on both the mirror backs and the truck. It's starting to get broken in now! Oh and the mirrors work fantastic!