You can never have too many mounting points, These O - Rings are great for strapping gear to your rig.  comes with the O - Rings and square nuts in a pack of 4 
 
Great for mounting traction boards or strapping down any gear.
 
3 different variations
-Jeep Wrangler Platform Racks Crossbars
-Jeep Wrangler Platform Rack Perimeter
-Truck Bed Rack Side Beams and Crossbars